diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ApplicationsClient.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ApplicationsClient.java
index 98936f3535da..e076fd18e447 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ApplicationsClient.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ApplicationsClient.java
@@ -37,8 +37,11 @@
  * calls that map to API methods. Sample code to get started:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (ApplicationsClient applicationsClient = ApplicationsClient.create()) {
  *   String name = "name3373707";
  *   Application response = applicationsClient.getApplication(name);
@@ -74,8 +77,11 @@
  * <p>To customize credentials:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * ApplicationsSettings applicationsSettings =
  *     ApplicationsSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -86,8 +92,11 @@
  * <p>To customize the endpoint:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * ApplicationsSettings applicationsSettings =
  *     ApplicationsSettings.newBuilder().setEndpoint(myEndpoint).build();
  * ApplicationsClient applicationsClient = ApplicationsClient.create(applicationsSettings);
@@ -97,8 +106,11 @@
  * the wire:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * ApplicationsSettings applicationsSettings =
  *     ApplicationsSettings.newBuilder()
  *         .setTransportChannelProvider(
@@ -190,8 +202,11 @@ public final OperationsClient getHttpJsonOperationsClient() {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ApplicationsClient applicationsClient = ApplicationsClient.create()) {
    *   String name = "name3373707";
    *   Application response = applicationsClient.getApplication(name);
@@ -213,8 +228,11 @@ public final Application getApplication(String name) {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ApplicationsClient applicationsClient = ApplicationsClient.create()) {
    *   GetApplicationRequest request =
    *       GetApplicationRequest.newBuilder().setName("name3373707").build();
@@ -236,8 +254,11 @@ public final Application getApplication(GetApplicationRequest request) {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ApplicationsClient applicationsClient = ApplicationsClient.create()) {
    *   GetApplicationRequest request =
    *       GetApplicationRequest.newBuilder().setName("name3373707").build();
@@ -268,8 +289,11 @@ public final UnaryCallable<GetApplicationRequest, Application> getApplicationCal
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ApplicationsClient applicationsClient = ApplicationsClient.create()) {
    *   CreateApplicationRequest request =
    *       CreateApplicationRequest.newBuilder()
@@ -303,8 +327,11 @@ public final OperationFuture<Application, OperationMetadataV1> createApplication
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ApplicationsClient applicationsClient = ApplicationsClient.create()) {
    *   CreateApplicationRequest request =
    *       CreateApplicationRequest.newBuilder()
@@ -338,8 +365,11 @@ public final OperationFuture<Application, OperationMetadataV1> createApplication
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ApplicationsClient applicationsClient = ApplicationsClient.create()) {
    *   CreateApplicationRequest request =
    *       CreateApplicationRequest.newBuilder()
@@ -370,8 +400,11 @@ public final UnaryCallable<CreateApplicationRequest, Operation> createApplicatio
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ApplicationsClient applicationsClient = ApplicationsClient.create()) {
    *   UpdateApplicationRequest request =
    *       UpdateApplicationRequest.newBuilder()
@@ -405,8 +438,11 @@ public final OperationFuture<Application, OperationMetadataV1> updateApplication
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ApplicationsClient applicationsClient = ApplicationsClient.create()) {
    *   UpdateApplicationRequest request =
    *       UpdateApplicationRequest.newBuilder()
@@ -440,8 +476,11 @@ public final OperationFuture<Application, OperationMetadataV1> updateApplication
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ApplicationsClient applicationsClient = ApplicationsClient.create()) {
    *   UpdateApplicationRequest request =
    *       UpdateApplicationRequest.newBuilder()
@@ -473,8 +512,11 @@ public final UnaryCallable<UpdateApplicationRequest, Operation> updateApplicatio
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ApplicationsClient applicationsClient = ApplicationsClient.create()) {
    *   RepairApplicationRequest request =
    *       RepairApplicationRequest.newBuilder().setName("name3373707").build();
@@ -503,8 +545,11 @@ public final OperationFuture<Application, OperationMetadataV1> repairApplication
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ApplicationsClient applicationsClient = ApplicationsClient.create()) {
    *   RepairApplicationRequest request =
    *       RepairApplicationRequest.newBuilder().setName("name3373707").build();
@@ -533,8 +578,11 @@ public final OperationFuture<Application, OperationMetadataV1> repairApplication
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ApplicationsClient applicationsClient = ApplicationsClient.create()) {
    *   RepairApplicationRequest request =
    *       RepairApplicationRequest.newBuilder().setName("name3373707").build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ApplicationsSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ApplicationsSettings.java
index e47a5f719fa5..7c8d82e8a7a9 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ApplicationsSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ApplicationsSettings.java
@@ -52,16 +52,16 @@
  * <p>For example, to set the total timeout of getApplication to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * ApplicationsSettings.Builder applicationsSettingsBuilder = ApplicationsSettings.newBuilder();
  * applicationsSettingsBuilder
  *     .getApplicationSettings()
  *     .setRetrySettings(
- *         applicationsSettingsBuilder
- *             .getApplicationSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         applicationsSettingsBuilder.getApplicationSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * ApplicationsSettings applicationsSettings = applicationsSettingsBuilder.build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedCertificatesClient.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedCertificatesClient.java
index 2f032fe7d9fe..0d2f3bd727ae 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedCertificatesClient.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedCertificatesClient.java
@@ -42,8 +42,11 @@
  * calls that map to API methods. Sample code to get started:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (AuthorizedCertificatesClient authorizedCertificatesClient =
  *     AuthorizedCertificatesClient.create()) {
  *   GetAuthorizedCertificateRequest request =
@@ -86,8 +89,11 @@
  * <p>To customize credentials:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * AuthorizedCertificatesSettings authorizedCertificatesSettings =
  *     AuthorizedCertificatesSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -99,8 +105,11 @@
  * <p>To customize the endpoint:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * AuthorizedCertificatesSettings authorizedCertificatesSettings =
  *     AuthorizedCertificatesSettings.newBuilder().setEndpoint(myEndpoint).build();
  * AuthorizedCertificatesClient authorizedCertificatesClient =
@@ -111,8 +120,11 @@
  * the wire:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * AuthorizedCertificatesSettings authorizedCertificatesSettings =
  *     AuthorizedCertificatesSettings.newBuilder()
  *         .setTransportChannelProvider(
@@ -182,8 +194,11 @@ public AuthorizedCertificatesStub getStub() {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (AuthorizedCertificatesClient authorizedCertificatesClient =
    *     AuthorizedCertificatesClient.create()) {
    *   ListAuthorizedCertificatesRequest request =
@@ -215,8 +230,11 @@ public final ListAuthorizedCertificatesPagedResponse listAuthorizedCertificates(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (AuthorizedCertificatesClient authorizedCertificatesClient =
    *     AuthorizedCertificatesClient.create()) {
    *   ListAuthorizedCertificatesRequest request =
@@ -250,8 +268,11 @@ public final ListAuthorizedCertificatesPagedResponse listAuthorizedCertificates(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (AuthorizedCertificatesClient authorizedCertificatesClient =
    *     AuthorizedCertificatesClient.create()) {
    *   ListAuthorizedCertificatesRequest request =
@@ -289,8 +310,11 @@ public final ListAuthorizedCertificatesPagedResponse listAuthorizedCertificates(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (AuthorizedCertificatesClient authorizedCertificatesClient =
    *     AuthorizedCertificatesClient.create()) {
    *   GetAuthorizedCertificateRequest request =
@@ -318,8 +342,11 @@ public final AuthorizedCertificate getAuthorizedCertificate(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (AuthorizedCertificatesClient authorizedCertificatesClient =
    *     AuthorizedCertificatesClient.create()) {
    *   GetAuthorizedCertificateRequest request =
@@ -346,8 +373,11 @@ public final AuthorizedCertificate getAuthorizedCertificate(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (AuthorizedCertificatesClient authorizedCertificatesClient =
    *     AuthorizedCertificatesClient.create()) {
    *   CreateAuthorizedCertificateRequest request =
@@ -375,8 +405,11 @@ public final AuthorizedCertificate createAuthorizedCertificate(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (AuthorizedCertificatesClient authorizedCertificatesClient =
    *     AuthorizedCertificatesClient.create()) {
    *   CreateAuthorizedCertificateRequest request =
@@ -406,8 +439,11 @@ public final AuthorizedCertificate createAuthorizedCertificate(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (AuthorizedCertificatesClient authorizedCertificatesClient =
    *     AuthorizedCertificatesClient.create()) {
    *   UpdateAuthorizedCertificateRequest request =
@@ -439,8 +475,11 @@ public final AuthorizedCertificate updateAuthorizedCertificate(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (AuthorizedCertificatesClient authorizedCertificatesClient =
    *     AuthorizedCertificatesClient.create()) {
    *   UpdateAuthorizedCertificateRequest request =
@@ -468,8 +507,11 @@ public final AuthorizedCertificate updateAuthorizedCertificate(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (AuthorizedCertificatesClient authorizedCertificatesClient =
    *     AuthorizedCertificatesClient.create()) {
    *   DeleteAuthorizedCertificateRequest request =
@@ -492,8 +534,11 @@ public final void deleteAuthorizedCertificate(DeleteAuthorizedCertificateRequest
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (AuthorizedCertificatesClient authorizedCertificatesClient =
    *     AuthorizedCertificatesClient.create()) {
    *   DeleteAuthorizedCertificateRequest request =
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedCertificatesSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedCertificatesSettings.java
index 42213f60991f..4d328f1c3f56 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedCertificatesSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedCertificatesSettings.java
@@ -54,8 +54,11 @@
  * <p>For example, to set the total timeout of getAuthorizedCertificate to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * AuthorizedCertificatesSettings.Builder authorizedCertificatesSettingsBuilder =
  *     AuthorizedCertificatesSettings.newBuilder();
  * authorizedCertificatesSettingsBuilder
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedDomainsClient.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedDomainsClient.java
index dea2e3282a6a..2b4c829248af 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedDomainsClient.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedDomainsClient.java
@@ -42,8 +42,11 @@
  * calls that map to API methods. Sample code to get started:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (AuthorizedDomainsClient authorizedDomainsClient = AuthorizedDomainsClient.create()) {
  *   ListAuthorizedDomainsRequest request =
  *       ListAuthorizedDomainsRequest.newBuilder()
@@ -88,8 +91,11 @@
  * <p>To customize credentials:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * AuthorizedDomainsSettings authorizedDomainsSettings =
  *     AuthorizedDomainsSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -101,8 +107,11 @@
  * <p>To customize the endpoint:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * AuthorizedDomainsSettings authorizedDomainsSettings =
  *     AuthorizedDomainsSettings.newBuilder().setEndpoint(myEndpoint).build();
  * AuthorizedDomainsClient authorizedDomainsClient =
@@ -113,8 +122,11 @@
  * the wire:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * AuthorizedDomainsSettings authorizedDomainsSettings =
  *     AuthorizedDomainsSettings.newBuilder()
  *         .setTransportChannelProvider(
@@ -183,8 +195,11 @@ public AuthorizedDomainsStub getStub() {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (AuthorizedDomainsClient authorizedDomainsClient = AuthorizedDomainsClient.create()) {
    *   ListAuthorizedDomainsRequest request =
    *       ListAuthorizedDomainsRequest.newBuilder()
@@ -214,8 +229,11 @@ public final ListAuthorizedDomainsPagedResponse listAuthorizedDomains(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (AuthorizedDomainsClient authorizedDomainsClient = AuthorizedDomainsClient.create()) {
    *   ListAuthorizedDomainsRequest request =
    *       ListAuthorizedDomainsRequest.newBuilder()
@@ -244,8 +262,11 @@ public final ListAuthorizedDomainsPagedResponse listAuthorizedDomains(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (AuthorizedDomainsClient authorizedDomainsClient = AuthorizedDomainsClient.create()) {
    *   ListAuthorizedDomainsRequest request =
    *       ListAuthorizedDomainsRequest.newBuilder()
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedDomainsSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedDomainsSettings.java
index 762544736cf1..2f6f9131c08b 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedDomainsSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/AuthorizedDomainsSettings.java
@@ -53,8 +53,11 @@
  * <p>For example, to set the total timeout of listAuthorizedDomains to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * AuthorizedDomainsSettings.Builder authorizedDomainsSettingsBuilder =
  *     AuthorizedDomainsSettings.newBuilder();
  * authorizedDomainsSettingsBuilder
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/DomainMappingsClient.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/DomainMappingsClient.java
index 3ed91d0eeac5..f5e2e97c7497 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/DomainMappingsClient.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/DomainMappingsClient.java
@@ -46,8 +46,11 @@
  * calls that map to API methods. Sample code to get started:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
  *   GetDomainMappingRequest request =
  *       GetDomainMappingRequest.newBuilder().setName("name3373707").build();
@@ -84,8 +87,11 @@
  * <p>To customize credentials:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * DomainMappingsSettings domainMappingsSettings =
  *     DomainMappingsSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -96,8 +102,11 @@
  * <p>To customize the endpoint:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * DomainMappingsSettings domainMappingsSettings =
  *     DomainMappingsSettings.newBuilder().setEndpoint(myEndpoint).build();
  * DomainMappingsClient domainMappingsClient = DomainMappingsClient.create(domainMappingsSettings);
@@ -107,8 +116,11 @@
  * the wire:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * DomainMappingsSettings domainMappingsSettings =
  *     DomainMappingsSettings.newBuilder()
  *         .setTransportChannelProvider(
@@ -201,8 +213,11 @@ public final OperationsClient getHttpJsonOperationsClient() {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
    *   ListDomainMappingsRequest request =
    *       ListDomainMappingsRequest.newBuilder()
@@ -231,8 +246,11 @@ public final ListDomainMappingsPagedResponse listDomainMappings(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
    *   ListDomainMappingsRequest request =
    *       ListDomainMappingsRequest.newBuilder()
@@ -261,8 +279,11 @@ public final ListDomainMappingsPagedResponse listDomainMappings(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
    *   ListDomainMappingsRequest request =
    *       ListDomainMappingsRequest.newBuilder()
@@ -298,8 +319,11 @@ public final ListDomainMappingsPagedResponse listDomainMappings(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
    *   GetDomainMappingRequest request =
    *       GetDomainMappingRequest.newBuilder().setName("name3373707").build();
@@ -321,8 +345,11 @@ public final DomainMapping getDomainMapping(GetDomainMappingRequest request) {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
    *   GetDomainMappingRequest request =
    *       GetDomainMappingRequest.newBuilder().setName("name3373707").build();
@@ -346,8 +373,11 @@ public final UnaryCallable<GetDomainMappingRequest, DomainMapping> getDomainMapp
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
    *   CreateDomainMappingRequest request =
    *       CreateDomainMappingRequest.newBuilder()
@@ -376,8 +406,11 @@ public final OperationFuture<DomainMapping, OperationMetadataV1> createDomainMap
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
    *   CreateDomainMappingRequest request =
    *       CreateDomainMappingRequest.newBuilder()
@@ -406,8 +439,11 @@ public final OperationFuture<DomainMapping, OperationMetadataV1> createDomainMap
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
    *   CreateDomainMappingRequest request =
    *       CreateDomainMappingRequest.newBuilder()
@@ -435,8 +471,11 @@ public final UnaryCallable<CreateDomainMappingRequest, Operation> createDomainMa
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
    *   UpdateDomainMappingRequest request =
    *       UpdateDomainMappingRequest.newBuilder()
@@ -465,8 +504,11 @@ public final OperationFuture<DomainMapping, OperationMetadataV1> updateDomainMap
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
    *   UpdateDomainMappingRequest request =
    *       UpdateDomainMappingRequest.newBuilder()
@@ -495,8 +537,11 @@ public final OperationFuture<DomainMapping, OperationMetadataV1> updateDomainMap
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
    *   UpdateDomainMappingRequest request =
    *       UpdateDomainMappingRequest.newBuilder()
@@ -523,8 +568,11 @@ public final UnaryCallable<UpdateDomainMappingRequest, Operation> updateDomainMa
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
    *   DeleteDomainMappingRequest request =
    *       DeleteDomainMappingRequest.newBuilder().setName("name3373707").build();
@@ -548,8 +596,11 @@ public final OperationFuture<Empty, OperationMetadataV1> deleteDomainMappingAsyn
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
    *   DeleteDomainMappingRequest request =
    *       DeleteDomainMappingRequest.newBuilder().setName("name3373707").build();
@@ -573,8 +624,11 @@ public final OperationFuture<Empty, OperationMetadataV1> deleteDomainMappingAsyn
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
    *   DeleteDomainMappingRequest request =
    *       DeleteDomainMappingRequest.newBuilder().setName("name3373707").build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/DomainMappingsSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/DomainMappingsSettings.java
index b8e6265c2e9b..42e83e5fc263 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/DomainMappingsSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/DomainMappingsSettings.java
@@ -56,17 +56,17 @@
  * <p>For example, to set the total timeout of getDomainMapping to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * DomainMappingsSettings.Builder domainMappingsSettingsBuilder =
  *     DomainMappingsSettings.newBuilder();
  * domainMappingsSettingsBuilder
  *     .getDomainMappingSettings()
  *     .setRetrySettings(
- *         domainMappingsSettingsBuilder
- *             .getDomainMappingSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         domainMappingsSettingsBuilder.getDomainMappingSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * DomainMappingsSettings domainMappingsSettings = domainMappingsSettingsBuilder.build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/FirewallClient.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/FirewallClient.java
index 05317b9cdf8a..c6d28fd703ed 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/FirewallClient.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/FirewallClient.java
@@ -50,8 +50,11 @@
  * calls that map to API methods. Sample code to get started:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (FirewallClient firewallClient = FirewallClient.create()) {
  *   BatchUpdateIngressRulesRequest request =
  *       BatchUpdateIngressRulesRequest.newBuilder()
@@ -91,8 +94,11 @@
  * <p>To customize credentials:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * FirewallSettings firewallSettings =
  *     FirewallSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -103,8 +109,11 @@
  * <p>To customize the endpoint:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * FirewallSettings firewallSettings =
  *     FirewallSettings.newBuilder().setEndpoint(myEndpoint).build();
  * FirewallClient firewallClient = FirewallClient.create(firewallSettings);
@@ -114,8 +123,11 @@
  * the wire:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * FirewallSettings firewallSettings =
  *     FirewallSettings.newBuilder()
  *         .setTransportChannelProvider(
@@ -181,8 +193,11 @@ public FirewallStub getStub() {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (FirewallClient firewallClient = FirewallClient.create()) {
    *   ListIngressRulesRequest request =
    *       ListIngressRulesRequest.newBuilder()
@@ -211,8 +226,11 @@ public final ListIngressRulesPagedResponse listIngressRules(ListIngressRulesRequ
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (FirewallClient firewallClient = FirewallClient.create()) {
    *   ListIngressRulesRequest request =
    *       ListIngressRulesRequest.newBuilder()
@@ -242,8 +260,11 @@ public final ListIngressRulesPagedResponse listIngressRules(ListIngressRulesRequ
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (FirewallClient firewallClient = FirewallClient.create()) {
    *   ListIngressRulesRequest request =
    *       ListIngressRulesRequest.newBuilder()
@@ -283,8 +304,11 @@ public final ListIngressRulesPagedResponse listIngressRules(ListIngressRulesRequ
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (FirewallClient firewallClient = FirewallClient.create()) {
    *   BatchUpdateIngressRulesRequest request =
    *       BatchUpdateIngressRulesRequest.newBuilder()
@@ -314,8 +338,11 @@ public final BatchUpdateIngressRulesResponse batchUpdateIngressRules(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (FirewallClient firewallClient = FirewallClient.create()) {
    *   BatchUpdateIngressRulesRequest request =
    *       BatchUpdateIngressRulesRequest.newBuilder()
@@ -341,8 +368,11 @@ public final BatchUpdateIngressRulesResponse batchUpdateIngressRules(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (FirewallClient firewallClient = FirewallClient.create()) {
    *   CreateIngressRuleRequest request =
    *       CreateIngressRuleRequest.newBuilder()
@@ -367,8 +397,11 @@ public final FirewallRule createIngressRule(CreateIngressRuleRequest request) {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (FirewallClient firewallClient = FirewallClient.create()) {
    *   CreateIngressRuleRequest request =
    *       CreateIngressRuleRequest.newBuilder()
@@ -393,8 +426,11 @@ public final UnaryCallable<CreateIngressRuleRequest, FirewallRule> createIngress
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (FirewallClient firewallClient = FirewallClient.create()) {
    *   GetIngressRuleRequest request =
    *       GetIngressRuleRequest.newBuilder().setName("name3373707").build();
@@ -416,8 +452,11 @@ public final FirewallRule getIngressRule(GetIngressRuleRequest request) {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (FirewallClient firewallClient = FirewallClient.create()) {
    *   GetIngressRuleRequest request =
    *       GetIngressRuleRequest.newBuilder().setName("name3373707").build();
@@ -438,8 +477,11 @@ public final UnaryCallable<GetIngressRuleRequest, FirewallRule> getIngressRuleCa
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (FirewallClient firewallClient = FirewallClient.create()) {
    *   UpdateIngressRuleRequest request =
    *       UpdateIngressRuleRequest.newBuilder()
@@ -465,8 +507,11 @@ public final FirewallRule updateIngressRule(UpdateIngressRuleRequest request) {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (FirewallClient firewallClient = FirewallClient.create()) {
    *   UpdateIngressRuleRequest request =
    *       UpdateIngressRuleRequest.newBuilder()
@@ -492,8 +537,11 @@ public final UnaryCallable<UpdateIngressRuleRequest, FirewallRule> updateIngress
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (FirewallClient firewallClient = FirewallClient.create()) {
    *   DeleteIngressRuleRequest request =
    *       DeleteIngressRuleRequest.newBuilder().setName("name3373707").build();
@@ -515,8 +563,11 @@ public final void deleteIngressRule(DeleteIngressRuleRequest request) {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (FirewallClient firewallClient = FirewallClient.create()) {
    *   DeleteIngressRuleRequest request =
    *       DeleteIngressRuleRequest.newBuilder().setName("name3373707").build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/FirewallSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/FirewallSettings.java
index cf6191be100c..97586d3c3649 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/FirewallSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/FirewallSettings.java
@@ -55,16 +55,16 @@
  * <p>For example, to set the total timeout of batchUpdateIngressRules to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * FirewallSettings.Builder firewallSettingsBuilder = FirewallSettings.newBuilder();
  * firewallSettingsBuilder
  *     .batchUpdateIngressRulesSettings()
  *     .setRetrySettings(
- *         firewallSettingsBuilder
- *             .batchUpdateIngressRulesSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         firewallSettingsBuilder.batchUpdateIngressRulesSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * FirewallSettings firewallSettings = firewallSettingsBuilder.build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/InstancesClient.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/InstancesClient.java
index 53c0aa810dfa..752f0f3f8503 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/InstancesClient.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/InstancesClient.java
@@ -46,8 +46,11 @@
  * calls that map to API methods. Sample code to get started:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (InstancesClient instancesClient = InstancesClient.create()) {
  *   GetInstanceRequest request = GetInstanceRequest.newBuilder().setName("name3373707").build();
  *   Instance response = instancesClient.getInstance(request);
@@ -83,8 +86,11 @@
  * <p>To customize credentials:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * InstancesSettings instancesSettings =
  *     InstancesSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -95,8 +101,11 @@
  * <p>To customize the endpoint:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * InstancesSettings instancesSettings =
  *     InstancesSettings.newBuilder().setEndpoint(myEndpoint).build();
  * InstancesClient instancesClient = InstancesClient.create(instancesSettings);
@@ -106,8 +115,11 @@
  * the wire:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * InstancesSettings instancesSettings =
  *     InstancesSettings.newBuilder()
  *         .setTransportChannelProvider(
@@ -201,8 +213,11 @@ public final OperationsClient getHttpJsonOperationsClient() {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (InstancesClient instancesClient = InstancesClient.create()) {
    *   ListInstancesRequest request =
    *       ListInstancesRequest.newBuilder()
@@ -233,8 +248,11 @@ public final ListInstancesPagedResponse listInstances(ListInstancesRequest reque
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (InstancesClient instancesClient = InstancesClient.create()) {
    *   ListInstancesRequest request =
    *       ListInstancesRequest.newBuilder()
@@ -265,8 +283,11 @@ public final ListInstancesPagedResponse listInstances(ListInstancesRequest reque
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (InstancesClient instancesClient = InstancesClient.create()) {
    *   ListInstancesRequest request =
    *       ListInstancesRequest.newBuilder()
@@ -300,8 +321,11 @@ public final UnaryCallable<ListInstancesRequest, ListInstancesResponse> listInst
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (InstancesClient instancesClient = InstancesClient.create()) {
    *   GetInstanceRequest request = GetInstanceRequest.newBuilder().setName("name3373707").build();
    *   Instance response = instancesClient.getInstance(request);
@@ -322,8 +346,11 @@ public final Instance getInstance(GetInstanceRequest request) {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (InstancesClient instancesClient = InstancesClient.create()) {
    *   GetInstanceRequest request = GetInstanceRequest.newBuilder().setName("name3373707").build();
    *   ApiFuture<Instance> future = instancesClient.getInstanceCallable().futureCall(request);
@@ -355,8 +382,11 @@ public final UnaryCallable<GetInstanceRequest, Instance> getInstanceCallable() {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (InstancesClient instancesClient = InstancesClient.create()) {
    *   DeleteInstanceRequest request =
    *       DeleteInstanceRequest.newBuilder().setName("name3373707").build();
@@ -391,8 +421,11 @@ public final OperationFuture<Empty, OperationMetadataV1> deleteInstanceAsync(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (InstancesClient instancesClient = InstancesClient.create()) {
    *   DeleteInstanceRequest request =
    *       DeleteInstanceRequest.newBuilder().setName("name3373707").build();
@@ -427,8 +460,11 @@ public final OperationFuture<Empty, OperationMetadataV1> deleteInstanceAsync(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (InstancesClient instancesClient = InstancesClient.create()) {
    *   DeleteInstanceRequest request =
    *       DeleteInstanceRequest.newBuilder().setName("name3373707").build();
@@ -454,8 +490,11 @@ public final UnaryCallable<DeleteInstanceRequest, Operation> deleteInstanceCalla
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (InstancesClient instancesClient = InstancesClient.create()) {
    *   DebugInstanceRequest request =
    *       DebugInstanceRequest.newBuilder()
@@ -486,8 +525,11 @@ public final OperationFuture<Instance, OperationMetadataV1> debugInstanceAsync(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (InstancesClient instancesClient = InstancesClient.create()) {
    *   DebugInstanceRequest request =
    *       DebugInstanceRequest.newBuilder()
@@ -518,8 +560,11 @@ public final OperationFuture<Instance, OperationMetadataV1> debugInstanceAsync(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (InstancesClient instancesClient = InstancesClient.create()) {
    *   DebugInstanceRequest request =
    *       DebugInstanceRequest.newBuilder()
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/InstancesSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/InstancesSettings.java
index 4c0c3f03561d..0b81a64f21fb 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/InstancesSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/InstancesSettings.java
@@ -56,16 +56,16 @@
  * <p>For example, to set the total timeout of getInstance to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * InstancesSettings.Builder instancesSettingsBuilder = InstancesSettings.newBuilder();
  * instancesSettingsBuilder
  *     .getInstanceSettings()
  *     .setRetrySettings(
- *         instancesSettingsBuilder
- *             .getInstanceSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         instancesSettingsBuilder.getInstanceSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * InstancesSettings instancesSettings = instancesSettingsBuilder.build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ServicesClient.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ServicesClient.java
index ccbf0f8b7752..8ae3bd621fbf 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ServicesClient.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ServicesClient.java
@@ -46,8 +46,11 @@
  * calls that map to API methods. Sample code to get started:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (ServicesClient servicesClient = ServicesClient.create()) {
  *   GetServiceRequest request = GetServiceRequest.newBuilder().setName("name3373707").build();
  *   Service response = servicesClient.getService(request);
@@ -83,8 +86,11 @@
  * <p>To customize credentials:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * ServicesSettings servicesSettings =
  *     ServicesSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -95,8 +101,11 @@
  * <p>To customize the endpoint:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * ServicesSettings servicesSettings =
  *     ServicesSettings.newBuilder().setEndpoint(myEndpoint).build();
  * ServicesClient servicesClient = ServicesClient.create(servicesSettings);
@@ -106,8 +115,11 @@
  * the wire:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * ServicesSettings servicesSettings =
  *     ServicesSettings.newBuilder()
  *         .setTransportChannelProvider(
@@ -198,8 +210,11 @@ public final OperationsClient getHttpJsonOperationsClient() {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ServicesClient servicesClient = ServicesClient.create()) {
    *   ListServicesRequest request =
    *       ListServicesRequest.newBuilder()
@@ -227,8 +242,11 @@ public final ListServicesPagedResponse listServices(ListServicesRequest request)
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ServicesClient servicesClient = ServicesClient.create()) {
    *   ListServicesRequest request =
    *       ListServicesRequest.newBuilder()
@@ -256,8 +274,11 @@ public final ListServicesPagedResponse listServices(ListServicesRequest request)
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ServicesClient servicesClient = ServicesClient.create()) {
    *   ListServicesRequest request =
    *       ListServicesRequest.newBuilder()
@@ -291,8 +312,11 @@ public final UnaryCallable<ListServicesRequest, ListServicesResponse> listServic
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ServicesClient servicesClient = ServicesClient.create()) {
    *   GetServiceRequest request = GetServiceRequest.newBuilder().setName("name3373707").build();
    *   Service response = servicesClient.getService(request);
@@ -313,8 +337,11 @@ public final Service getService(GetServiceRequest request) {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ServicesClient servicesClient = ServicesClient.create()) {
    *   GetServiceRequest request = GetServiceRequest.newBuilder().setName("name3373707").build();
    *   ApiFuture<Service> future = servicesClient.getServiceCallable().futureCall(request);
@@ -334,8 +361,11 @@ public final UnaryCallable<GetServiceRequest, Service> getServiceCallable() {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ServicesClient servicesClient = ServicesClient.create()) {
    *   UpdateServiceRequest request =
    *       UpdateServiceRequest.newBuilder()
@@ -363,8 +393,11 @@ public final OperationFuture<Service, OperationMetadataV1> updateServiceAsync(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ServicesClient servicesClient = ServicesClient.create()) {
    *   UpdateServiceRequest request =
    *       UpdateServiceRequest.newBuilder()
@@ -392,8 +425,11 @@ public final OperationFuture<Service, OperationMetadataV1> updateServiceAsync(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ServicesClient servicesClient = ServicesClient.create()) {
    *   UpdateServiceRequest request =
    *       UpdateServiceRequest.newBuilder()
@@ -419,8 +455,11 @@ public final UnaryCallable<UpdateServiceRequest, Operation> updateServiceCallabl
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ServicesClient servicesClient = ServicesClient.create()) {
    *   DeleteServiceRequest request =
    *       DeleteServiceRequest.newBuilder().setName("name3373707").build();
@@ -443,8 +482,11 @@ public final OperationFuture<Empty, OperationMetadataV1> deleteServiceAsync(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ServicesClient servicesClient = ServicesClient.create()) {
    *   DeleteServiceRequest request =
    *       DeleteServiceRequest.newBuilder().setName("name3373707").build();
@@ -467,8 +509,11 @@ public final OperationFuture<Empty, OperationMetadataV1> deleteServiceAsync(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (ServicesClient servicesClient = ServicesClient.create()) {
    *   DeleteServiceRequest request =
    *       DeleteServiceRequest.newBuilder().setName("name3373707").build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ServicesSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ServicesSettings.java
index f6223acf95ca..fa530eb5cc90 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ServicesSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/ServicesSettings.java
@@ -56,16 +56,16 @@
  * <p>For example, to set the total timeout of getService to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * ServicesSettings.Builder servicesSettingsBuilder = ServicesSettings.newBuilder();
  * servicesSettingsBuilder
  *     .getServiceSettings()
  *     .setRetrySettings(
- *         servicesSettingsBuilder
- *             .getServiceSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         servicesSettingsBuilder.getServiceSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * ServicesSettings servicesSettings = servicesSettingsBuilder.build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/VersionsClient.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/VersionsClient.java
index 05977fc70a8a..1e41abd4c0c3 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/VersionsClient.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/VersionsClient.java
@@ -46,8 +46,11 @@
  * calls that map to API methods. Sample code to get started:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (VersionsClient versionsClient = VersionsClient.create()) {
  *   GetVersionRequest request =
  *       GetVersionRequest.newBuilder()
@@ -87,8 +90,11 @@
  * <p>To customize credentials:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * VersionsSettings versionsSettings =
  *     VersionsSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -99,8 +105,11 @@
  * <p>To customize the endpoint:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * VersionsSettings versionsSettings =
  *     VersionsSettings.newBuilder().setEndpoint(myEndpoint).build();
  * VersionsClient versionsClient = VersionsClient.create(versionsSettings);
@@ -110,8 +119,11 @@
  * the wire:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * VersionsSettings versionsSettings =
  *     VersionsSettings.newBuilder()
  *         .setTransportChannelProvider(
@@ -202,8 +214,11 @@ public final OperationsClient getHttpJsonOperationsClient() {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (VersionsClient versionsClient = VersionsClient.create()) {
    *   ListVersionsRequest request =
    *       ListVersionsRequest.newBuilder()
@@ -232,8 +247,11 @@ public final ListVersionsPagedResponse listVersions(ListVersionsRequest request)
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (VersionsClient versionsClient = VersionsClient.create()) {
    *   ListVersionsRequest request =
    *       ListVersionsRequest.newBuilder()
@@ -262,8 +280,11 @@ public final ListVersionsPagedResponse listVersions(ListVersionsRequest request)
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (VersionsClient versionsClient = VersionsClient.create()) {
    *   ListVersionsRequest request =
    *       ListVersionsRequest.newBuilder()
@@ -299,8 +320,11 @@ public final UnaryCallable<ListVersionsRequest, ListVersionsResponse> listVersio
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (VersionsClient versionsClient = VersionsClient.create()) {
    *   GetVersionRequest request =
    *       GetVersionRequest.newBuilder()
@@ -326,8 +350,11 @@ public final Version getVersion(GetVersionRequest request) {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (VersionsClient versionsClient = VersionsClient.create()) {
    *   GetVersionRequest request =
    *       GetVersionRequest.newBuilder()
@@ -351,8 +378,11 @@ public final UnaryCallable<GetVersionRequest, Version> getVersionCallable() {
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (VersionsClient versionsClient = VersionsClient.create()) {
    *   CreateVersionRequest request =
    *       CreateVersionRequest.newBuilder()
@@ -378,8 +408,11 @@ public final OperationFuture<Version, CreateVersionMetadataV1> createVersionAsyn
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (VersionsClient versionsClient = VersionsClient.create()) {
    *   CreateVersionRequest request =
    *       CreateVersionRequest.newBuilder()
@@ -405,8 +438,11 @@ public final OperationFuture<Version, CreateVersionMetadataV1> createVersionAsyn
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (VersionsClient versionsClient = VersionsClient.create()) {
    *   CreateVersionRequest request =
    *       CreateVersionRequest.newBuilder()
@@ -476,8 +512,11 @@ public final UnaryCallable<CreateVersionRequest, Operation> createVersionCallabl
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (VersionsClient versionsClient = VersionsClient.create()) {
    *   UpdateVersionRequest request =
    *       UpdateVersionRequest.newBuilder()
@@ -550,8 +589,11 @@ public final OperationFuture<Version, OperationMetadataV1> updateVersionAsync(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (VersionsClient versionsClient = VersionsClient.create()) {
    *   UpdateVersionRequest request =
    *       UpdateVersionRequest.newBuilder()
@@ -624,8 +666,11 @@ public final OperationFuture<Version, OperationMetadataV1> updateVersionAsync(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (VersionsClient versionsClient = VersionsClient.create()) {
    *   UpdateVersionRequest request =
    *       UpdateVersionRequest.newBuilder()
@@ -650,8 +695,11 @@ public final UnaryCallable<UpdateVersionRequest, Operation> updateVersionCallabl
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (VersionsClient versionsClient = VersionsClient.create()) {
    *   DeleteVersionRequest request =
    *       DeleteVersionRequest.newBuilder().setName("name3373707").build();
@@ -674,8 +722,11 @@ public final OperationFuture<Empty, OperationMetadataV1> deleteVersionAsync(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (VersionsClient versionsClient = VersionsClient.create()) {
    *   DeleteVersionRequest request =
    *       DeleteVersionRequest.newBuilder().setName("name3373707").build();
@@ -698,8 +749,11 @@ public final OperationFuture<Empty, OperationMetadataV1> deleteVersionAsync(
    * <p>Sample code:
    *
    * <pre>{@code
-   * // This snippet has been automatically generated for illustrative purposes only.
-   * // It may require modifications to work in your environment.
+   * // This snippet has been automatically generated and should be regarded as a code template only.
+   * // It will require modifications to work:
+   * // - It may require correct/in-range values for request initialization.
+   * // - It may require specifying regional endpoints when creating the service client as shown in
+   * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
    * try (VersionsClient versionsClient = VersionsClient.create()) {
    *   DeleteVersionRequest request =
    *       DeleteVersionRequest.newBuilder().setName("name3373707").build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/VersionsSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/VersionsSettings.java
index 3cf4141de9cf..3d1f2410d633 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/VersionsSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/VersionsSettings.java
@@ -56,16 +56,16 @@
  * <p>For example, to set the total timeout of getVersion to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * VersionsSettings.Builder versionsSettingsBuilder = VersionsSettings.newBuilder();
  * versionsSettingsBuilder
  *     .getVersionSettings()
  *     .setRetrySettings(
- *         versionsSettingsBuilder
- *             .getVersionSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         versionsSettingsBuilder.getVersionSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * VersionsSettings versionsSettings = versionsSettingsBuilder.build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/package-info.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/package-info.java
index 34c5a5b2b80e..431c8e5b6f32 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/package-info.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/package-info.java
@@ -24,8 +24,11 @@
  * <p>Sample for ApplicationsClient:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (ApplicationsClient applicationsClient = ApplicationsClient.create()) {
  *   String name = "name3373707";
  *   Application response = applicationsClient.getApplication(name);
@@ -39,8 +42,11 @@
  * <p>Sample for ServicesClient:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (ServicesClient servicesClient = ServicesClient.create()) {
  *   GetServiceRequest request = GetServiceRequest.newBuilder().setName("name3373707").build();
  *   Service response = servicesClient.getService(request);
@@ -54,8 +60,11 @@
  * <p>Sample for VersionsClient:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (VersionsClient versionsClient = VersionsClient.create()) {
  *   GetVersionRequest request =
  *       GetVersionRequest.newBuilder()
@@ -73,8 +82,11 @@
  * <p>Sample for InstancesClient:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (InstancesClient instancesClient = InstancesClient.create()) {
  *   GetInstanceRequest request = GetInstanceRequest.newBuilder().setName("name3373707").build();
  *   Instance response = instancesClient.getInstance(request);
@@ -96,8 +108,11 @@
  * <p>Sample for FirewallClient:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (FirewallClient firewallClient = FirewallClient.create()) {
  *   BatchUpdateIngressRulesRequest request =
  *       BatchUpdateIngressRulesRequest.newBuilder()
@@ -117,8 +132,11 @@
  * <p>Sample for AuthorizedDomainsClient:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (AuthorizedDomainsClient authorizedDomainsClient = AuthorizedDomainsClient.create()) {
  *   ListAuthorizedDomainsRequest request =
  *       ListAuthorizedDomainsRequest.newBuilder()
@@ -141,8 +159,11 @@
  * <p>Sample for AuthorizedCertificatesClient:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (AuthorizedCertificatesClient authorizedCertificatesClient =
  *     AuthorizedCertificatesClient.create()) {
  *   GetAuthorizedCertificateRequest request =
@@ -162,8 +183,11 @@
  * <p>Sample for DomainMappingsClient:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * try (DomainMappingsClient domainMappingsClient = DomainMappingsClient.create()) {
  *   GetDomainMappingRequest request =
  *       GetDomainMappingRequest.newBuilder().setName("name3373707").build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/ApplicationsStubSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/ApplicationsStubSettings.java
index 854cd87fd0d5..cd1d302d05c8 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/ApplicationsStubSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/ApplicationsStubSettings.java
@@ -72,17 +72,17 @@
  * <p>For example, to set the total timeout of getApplication to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * ApplicationsStubSettings.Builder applicationsSettingsBuilder =
  *     ApplicationsStubSettings.newBuilder();
  * applicationsSettingsBuilder
  *     .getApplicationSettings()
  *     .setRetrySettings(
- *         applicationsSettingsBuilder
- *             .getApplicationSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         applicationsSettingsBuilder.getApplicationSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * ApplicationsStubSettings applicationsSettings = applicationsSettingsBuilder.build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/AuthorizedCertificatesStubSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/AuthorizedCertificatesStubSettings.java
index ff1a841b71ec..e5627eaf196d 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/AuthorizedCertificatesStubSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/AuthorizedCertificatesStubSettings.java
@@ -78,8 +78,11 @@
  * <p>For example, to set the total timeout of getAuthorizedCertificate to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * AuthorizedCertificatesStubSettings.Builder authorizedCertificatesSettingsBuilder =
  *     AuthorizedCertificatesStubSettings.newBuilder();
  * authorizedCertificatesSettingsBuilder
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/AuthorizedDomainsStubSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/AuthorizedDomainsStubSettings.java
index 31db72663957..f4ac9eaa6c13 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/AuthorizedDomainsStubSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/AuthorizedDomainsStubSettings.java
@@ -73,8 +73,11 @@
  * <p>For example, to set the total timeout of listAuthorizedDomains to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * AuthorizedDomainsStubSettings.Builder authorizedDomainsSettingsBuilder =
  *     AuthorizedDomainsStubSettings.newBuilder();
  * authorizedDomainsSettingsBuilder
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/DomainMappingsStubSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/DomainMappingsStubSettings.java
index b069005137ba..aabb8f07efdf 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/DomainMappingsStubSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/DomainMappingsStubSettings.java
@@ -84,17 +84,17 @@
  * <p>For example, to set the total timeout of getDomainMapping to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * DomainMappingsStubSettings.Builder domainMappingsSettingsBuilder =
  *     DomainMappingsStubSettings.newBuilder();
  * domainMappingsSettingsBuilder
  *     .getDomainMappingSettings()
  *     .setRetrySettings(
- *         domainMappingsSettingsBuilder
- *             .getDomainMappingSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         domainMappingsSettingsBuilder.getDomainMappingSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * DomainMappingsStubSettings domainMappingsSettings = domainMappingsSettingsBuilder.build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/FirewallStubSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/FirewallStubSettings.java
index 90e5ee7cc9aa..ddeb6239f01d 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/FirewallStubSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/FirewallStubSettings.java
@@ -80,16 +80,16 @@
  * <p>For example, to set the total timeout of batchUpdateIngressRules to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * FirewallStubSettings.Builder firewallSettingsBuilder = FirewallStubSettings.newBuilder();
  * firewallSettingsBuilder
  *     .batchUpdateIngressRulesSettings()
  *     .setRetrySettings(
- *         firewallSettingsBuilder
- *             .batchUpdateIngressRulesSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         firewallSettingsBuilder.batchUpdateIngressRulesSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * FirewallStubSettings firewallSettings = firewallSettingsBuilder.build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonApplicationsStub.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonApplicationsStub.java
index 0a58e58777f3..4cdd13c79d57 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonApplicationsStub.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonApplicationsStub.java
@@ -121,7 +121,7 @@ public class HttpJsonApplicationsStub extends ApplicationsStub {
                       .setRequestBodyExtractor(
                           request ->
                               ProtoRestSerializer.create()
-                                  .toBody("application", request.getApplication()))
+                                  .toBody("application", request.getApplication(), false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<Operation>newBuilder()
@@ -161,7 +161,7 @@ public class HttpJsonApplicationsStub extends ApplicationsStub {
                       .setRequestBodyExtractor(
                           request ->
                               ProtoRestSerializer.create()
-                                  .toBody("application", request.getApplication()))
+                                  .toBody("application", request.getApplication(), false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<Operation>newBuilder()
@@ -200,7 +200,7 @@ public class HttpJsonApplicationsStub extends ApplicationsStub {
                       .setRequestBodyExtractor(
                           request ->
                               ProtoRestSerializer.create()
-                                  .toBody("*", request.toBuilder().clearName().build()))
+                                  .toBody("*", request.toBuilder().clearName().build(), false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<Operation>newBuilder()
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonAuthorizedCertificatesStub.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonAuthorizedCertificatesStub.java
index f2f3b863dfd7..35b89833ca25 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonAuthorizedCertificatesStub.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonAuthorizedCertificatesStub.java
@@ -162,7 +162,7 @@ public class HttpJsonAuthorizedCertificatesStub extends AuthorizedCertificatesSt
                       .setRequestBodyExtractor(
                           request ->
                               ProtoRestSerializer.create()
-                                  .toBody("certificate", request.getCertificate()))
+                                  .toBody("certificate", request.getCertificate(), false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<AuthorizedCertificate>newBuilder()
@@ -202,7 +202,7 @@ public class HttpJsonAuthorizedCertificatesStub extends AuthorizedCertificatesSt
                       .setRequestBodyExtractor(
                           request ->
                               ProtoRestSerializer.create()
-                                  .toBody("certificate", request.getCertificate()))
+                                  .toBody("certificate", request.getCertificate(), false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<AuthorizedCertificate>newBuilder()
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonDomainMappingsStub.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonDomainMappingsStub.java
index 11ca17304b49..489a48783b28 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonDomainMappingsStub.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonDomainMappingsStub.java
@@ -165,7 +165,7 @@ public class HttpJsonDomainMappingsStub extends DomainMappingsStub {
                       .setRequestBodyExtractor(
                           request ->
                               ProtoRestSerializer.create()
-                                  .toBody("domainMapping", request.getDomainMapping()))
+                                  .toBody("domainMapping", request.getDomainMapping(), false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<Operation>newBuilder()
@@ -205,7 +205,7 @@ public class HttpJsonDomainMappingsStub extends DomainMappingsStub {
                       .setRequestBodyExtractor(
                           request ->
                               ProtoRestSerializer.create()
-                                  .toBody("domainMapping", request.getDomainMapping()))
+                                  .toBody("domainMapping", request.getDomainMapping(), false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<Operation>newBuilder()
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonFirewallStub.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonFirewallStub.java
index edbf82d303be..2a6cdaa7465e 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonFirewallStub.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonFirewallStub.java
@@ -126,7 +126,7 @@ public class HttpJsonFirewallStub extends FirewallStub {
                       .setRequestBodyExtractor(
                           request ->
                               ProtoRestSerializer.create()
-                                  .toBody("*", request.toBuilder().clearName().build()))
+                                  .toBody("*", request.toBuilder().clearName().build(), false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<BatchUpdateIngressRulesResponse>newBuilder()
@@ -160,7 +160,8 @@ public class HttpJsonFirewallStub extends FirewallStub {
                             return fields;
                           })
                       .setRequestBodyExtractor(
-                          request -> ProtoRestSerializer.create().toBody("rule", request.getRule()))
+                          request ->
+                              ProtoRestSerializer.create().toBody("rule", request.getRule(), false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<FirewallRule>newBuilder()
@@ -228,7 +229,8 @@ public class HttpJsonFirewallStub extends FirewallStub {
                             return fields;
                           })
                       .setRequestBodyExtractor(
-                          request -> ProtoRestSerializer.create().toBody("rule", request.getRule()))
+                          request ->
+                              ProtoRestSerializer.create().toBody("rule", request.getRule(), false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<FirewallRule>newBuilder()
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonInstancesStub.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonInstancesStub.java
index 19ec34aecfb7..de516cc76e7f 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonInstancesStub.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonInstancesStub.java
@@ -198,7 +198,7 @@ public class HttpJsonInstancesStub extends InstancesStub {
                       .setRequestBodyExtractor(
                           request ->
                               ProtoRestSerializer.create()
-                                  .toBody("*", request.toBuilder().clearName().build()))
+                                  .toBody("*", request.toBuilder().clearName().build(), false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<Operation>newBuilder()
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonServicesStub.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonServicesStub.java
index 92d91683b41e..5d7b02213838 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonServicesStub.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonServicesStub.java
@@ -163,7 +163,8 @@ public class HttpJsonServicesStub extends ServicesStub {
                           })
                       .setRequestBodyExtractor(
                           request ->
-                              ProtoRestSerializer.create().toBody("service", request.getService()))
+                              ProtoRestSerializer.create()
+                                  .toBody("service", request.getService(), false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<Operation>newBuilder()
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonVersionsStub.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonVersionsStub.java
index cca7aa763c17..8172abb904d1 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonVersionsStub.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/HttpJsonVersionsStub.java
@@ -165,7 +165,8 @@ public class HttpJsonVersionsStub extends VersionsStub {
                           })
                       .setRequestBodyExtractor(
                           request ->
-                              ProtoRestSerializer.create().toBody("version", request.getVersion()))
+                              ProtoRestSerializer.create()
+                                  .toBody("version", request.getVersion(), false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<Operation>newBuilder()
@@ -204,7 +205,8 @@ public class HttpJsonVersionsStub extends VersionsStub {
                           })
                       .setRequestBodyExtractor(
                           request ->
-                              ProtoRestSerializer.create().toBody("version", request.getVersion()))
+                              ProtoRestSerializer.create()
+                                  .toBody("version", request.getVersion(), false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<Operation>newBuilder()
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/InstancesStubSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/InstancesStubSettings.java
index 4d71901f373f..d4f46c788dcf 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/InstancesStubSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/InstancesStubSettings.java
@@ -83,16 +83,16 @@
  * <p>For example, to set the total timeout of getInstance to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * InstancesStubSettings.Builder instancesSettingsBuilder = InstancesStubSettings.newBuilder();
  * instancesSettingsBuilder
  *     .getInstanceSettings()
  *     .setRetrySettings(
- *         instancesSettingsBuilder
- *             .getInstanceSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         instancesSettingsBuilder.getInstanceSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * InstancesStubSettings instancesSettings = instancesSettingsBuilder.build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/ServicesStubSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/ServicesStubSettings.java
index 2b230cd125bc..161e47fb50fc 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/ServicesStubSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/ServicesStubSettings.java
@@ -83,16 +83,16 @@
  * <p>For example, to set the total timeout of getService to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * ServicesStubSettings.Builder servicesSettingsBuilder = ServicesStubSettings.newBuilder();
  * servicesSettingsBuilder
  *     .getServiceSettings()
  *     .setRetrySettings(
- *         servicesSettingsBuilder
- *             .getServiceSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         servicesSettingsBuilder.getServiceSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * ServicesStubSettings servicesSettings = servicesSettingsBuilder.build();
diff --git a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/VersionsStubSettings.java b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/VersionsStubSettings.java
index 7404285aba44..300b04cd9122 100644
--- a/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/VersionsStubSettings.java
+++ b/java-appengine-admin/google-cloud-appengine-admin/src/main/java/com/google/appengine/v1/stub/VersionsStubSettings.java
@@ -85,16 +85,16 @@
  * <p>For example, to set the total timeout of getVersion to 30 seconds:
  *
  * <pre>{@code
- * // This snippet has been automatically generated for illustrative purposes only.
- * // It may require modifications to work in your environment.
+ * // This snippet has been automatically generated and should be regarded as a code template only.
+ * // It will require modifications to work:
+ * // - It may require correct/in-range values for request initialization.
+ * // - It may require specifying regional endpoints when creating the service client as shown in
+ * // https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
  * VersionsStubSettings.Builder versionsSettingsBuilder = VersionsStubSettings.newBuilder();
  * versionsSettingsBuilder
  *     .getVersionSettings()
  *     .setRetrySettings(
- *         versionsSettingsBuilder
- *             .getVersionSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         versionsSettingsBuilder.getVersionSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * VersionsStubSettings versionsSettings = versionsSettingsBuilder.build();