diff --git a/java-discoveryengine/.gitignore b/java-discoveryengine/.gitignore
new file mode 100644
index 000000000000..069d08fc73e8
--- /dev/null
+++ b/java-discoveryengine/.gitignore
@@ -0,0 +1,17 @@
+# Maven
+target/
+
+# Eclipse
+.classpath
+.project
+.settings
+
+# Intellij
+*.iml
+.idea/
+
+# python utilities
+*.pyc
+__pycache__
+
+.flattened-pom.xml
diff --git a/java-discoveryengine/README.md b/java-discoveryengine/README.md
index b1282f338650..c075b52307ab 100644
--- a/java-discoveryengine/README.md
+++ b/java-discoveryengine/README.md
@@ -22,20 +22,20 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-discoveryengine</artifactId>
-  <version>0.0.0</version>
+  <version>0.1.0</version>
 </dependency>
 ```
 
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-discoveryengine:0.0.0'
+implementation 'com.google.cloud:google-cloud-discoveryengine:0.1.0'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-discoveryengine" % "0.0.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-discoveryengine" % "0.1.0"
 ```
 
 ## Authentication
diff --git a/java-discoveryengine/google-cloud-discoveryengine-bom/pom.xml b/java-discoveryengine/google-cloud-discoveryengine-bom/pom.xml
index 616d2cd9fa1b..f1ff9ab4052a 100644
--- a/java-discoveryengine/google-cloud-discoveryengine-bom/pom.xml
+++ b/java-discoveryengine/google-cloud-discoveryengine-bom/pom.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version='1.0' encoding='UTF-8'?>
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.cloud</groupId>
diff --git a/java-discoveryengine/google-cloud-discoveryengine/pom.xml b/java-discoveryengine/google-cloud-discoveryengine/pom.xml
index e7a61b4c6c40..bcf1970e39d5 100644
--- a/java-discoveryengine/google-cloud-discoveryengine/pom.xml
+++ b/java-discoveryengine/google-cloud-discoveryengine/pom.xml
@@ -1,4 +1,4 @@
-<?xml version="1.0"?>
+<?xml version='1.0' encoding='UTF-8'?>
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.cloud</groupId>
@@ -110,4 +110,4 @@
       <scope>test</scope>
     </dependency>
   </dependencies>
-</project>
\ No newline at end of file
+</project>
diff --git a/java-discoveryengine/google-cloud-discoveryengine/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceClient.java b/java-discoveryengine/google-cloud-discoveryengine/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceClient.java
index 05fdfbac07af..8391618ebad1 100644
--- a/java-discoveryengine/google-cloud-discoveryengine/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceClient.java
+++ b/java-discoveryengine/google-cloud-discoveryengine/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceClient.java
@@ -51,6 +51,7 @@
  *           .setFilter("filter-1274492040")
  *           .setValidateOnly(true)
  *           .putAllParams(new HashMap<String, Value>())
+ *           .putAllUserLabels(new HashMap<String, String>())
  *           .build();
  *   RecommendResponse response = recommendationServiceClient.recommend(request);
  * }
@@ -209,6 +210,7 @@ public RecommendationServiceStub getStub() {
    *           .setFilter("filter-1274492040")
    *           .setValidateOnly(true)
    *           .putAllParams(new HashMap<String, Value>())
+   *           .putAllUserLabels(new HashMap<String, String>())
    *           .build();
    *   RecommendResponse response = recommendationServiceClient.recommend(request);
    * }
@@ -246,6 +248,7 @@ public final RecommendResponse recommend(RecommendRequest request) {
    *           .setFilter("filter-1274492040")
    *           .setValidateOnly(true)
    *           .putAllParams(new HashMap<String, Value>())
+   *           .putAllUserLabels(new HashMap<String, String>())
    *           .build();
    *   ApiFuture<RecommendResponse> future =
    *       recommendationServiceClient.recommendCallable().futureCall(request);
diff --git a/java-discoveryengine/google-cloud-discoveryengine/src/main/java/com/google/cloud/discoveryengine/v1beta/package-info.java b/java-discoveryengine/google-cloud-discoveryengine/src/main/java/com/google/cloud/discoveryengine/v1beta/package-info.java
index 2f021c0c5d85..bd70cd78ea8d 100644
--- a/java-discoveryengine/google-cloud-discoveryengine/src/main/java/com/google/cloud/discoveryengine/v1beta/package-info.java
+++ b/java-discoveryengine/google-cloud-discoveryengine/src/main/java/com/google/cloud/discoveryengine/v1beta/package-info.java
@@ -64,6 +64,7 @@
  *           .setFilter("filter-1274492040")
  *           .setValidateOnly(true)
  *           .putAllParams(new HashMap<String, Value>())
+ *           .putAllUserLabels(new HashMap<String, String>())
  *           .build();
  *   RecommendResponse response = recommendationServiceClient.recommend(request);
  * }
diff --git a/java-discoveryengine/google-cloud-discoveryengine/src/test/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceClientHttpJsonTest.java b/java-discoveryengine/google-cloud-discoveryengine/src/test/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceClientHttpJsonTest.java
index 526a629654af..06841e434940 100644
--- a/java-discoveryengine/google-cloud-discoveryengine/src/test/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceClientHttpJsonTest.java
+++ b/java-discoveryengine/google-cloud-discoveryengine/src/test/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceClientHttpJsonTest.java
@@ -95,6 +95,7 @@ public void recommendTest() throws Exception {
             .setFilter("filter-1274492040")
             .setValidateOnly(true)
             .putAllParams(new HashMap<String, Value>())
+            .putAllUserLabels(new HashMap<String, String>())
             .build();
 
     RecommendResponse actualResponse = client.recommend(request);
@@ -134,6 +135,7 @@ public void recommendExceptionTest() throws Exception {
               .setFilter("filter-1274492040")
               .setValidateOnly(true)
               .putAllParams(new HashMap<String, Value>())
+              .putAllUserLabels(new HashMap<String, String>())
               .build();
       client.recommend(request);
       Assert.fail("No exception raised");
diff --git a/java-discoveryengine/google-cloud-discoveryengine/src/test/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceClientTest.java b/java-discoveryengine/google-cloud-discoveryengine/src/test/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceClientTest.java
index 8d3b404f5dc9..582dc44c3c64 100644
--- a/java-discoveryengine/google-cloud-discoveryengine/src/test/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceClientTest.java
+++ b/java-discoveryengine/google-cloud-discoveryengine/src/test/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceClientTest.java
@@ -100,6 +100,7 @@ public void recommendTest() throws Exception {
             .setFilter("filter-1274492040")
             .setValidateOnly(true)
             .putAllParams(new HashMap<String, Value>())
+            .putAllUserLabels(new HashMap<String, String>())
             .build();
 
     RecommendResponse actualResponse = client.recommend(request);
@@ -115,6 +116,7 @@ public void recommendTest() throws Exception {
     Assert.assertEquals(request.getFilter(), actualRequest.getFilter());
     Assert.assertEquals(request.getValidateOnly(), actualRequest.getValidateOnly());
     Assert.assertEquals(request.getParamsMap(), actualRequest.getParamsMap());
+    Assert.assertEquals(request.getUserLabelsMap(), actualRequest.getUserLabelsMap());
     Assert.assertTrue(
         channelProvider.isHeaderSent(
             ApiClientHeaderProvider.getDefaultApiClientHeaderKey(),
@@ -138,6 +140,7 @@ public void recommendExceptionTest() throws Exception {
               .setFilter("filter-1274492040")
               .setValidateOnly(true)
               .putAllParams(new HashMap<String, Value>())
+              .putAllUserLabels(new HashMap<String, String>())
               .build();
       client.recommend(request);
       Assert.fail("No exception raised");
diff --git a/java-discoveryengine/pom.xml b/java-discoveryengine/pom.xml
index af2b4945ec91..0bc53df4e81b 100644
--- a/java-discoveryengine/pom.xml
+++ b/java-discoveryengine/pom.xml
@@ -50,4 +50,5 @@
     <module>proto-google-cloud-discoveryengine-v1beta</module>
     <module>google-cloud-discoveryengine-bom</module>
   </modules>
-</project>
+
+  </project>
diff --git a/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendRequest.java b/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendRequest.java
index be75da65107d..d50f3bc87ee1 100644
--- a/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendRequest.java
+++ b/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendRequest.java
@@ -64,6 +64,8 @@ protected com.google.protobuf.MapField internalGetMapField(int number) {
     switch (number) {
       case 6:
         return internalGetParams();
+      case 8:
+        return internalGetUserLabels();
       default:
         throw new RuntimeException("Invalid map field number: " + number);
     }
@@ -535,6 +537,161 @@ public com.google.protobuf.Value getParamsOrThrow(java.lang.String key) {
     return map.get(key);
   }
 
+  public static final int USER_LABELS_FIELD_NUMBER = 8;
+
+  private static final class UserLabelsDefaultEntryHolder {
+    static final com.google.protobuf.MapEntry<java.lang.String, java.lang.String> defaultEntry =
+        com.google.protobuf.MapEntry.<java.lang.String, java.lang.String>newDefaultInstance(
+            com.google.cloud.discoveryengine.v1beta.RecommendationServiceProto
+                .internal_static_google_cloud_discoveryengine_v1beta_RecommendRequest_UserLabelsEntry_descriptor,
+            com.google.protobuf.WireFormat.FieldType.STRING,
+            "",
+            com.google.protobuf.WireFormat.FieldType.STRING,
+            "");
+  }
+
+  private com.google.protobuf.MapField<java.lang.String, java.lang.String> userLabels_;
+
+  private com.google.protobuf.MapField<java.lang.String, java.lang.String> internalGetUserLabels() {
+    if (userLabels_ == null) {
+      return com.google.protobuf.MapField.emptyMapField(UserLabelsDefaultEntryHolder.defaultEntry);
+    }
+    return userLabels_;
+  }
+
+  public int getUserLabelsCount() {
+    return internalGetUserLabels().getMap().size();
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The user labels applied to a resource must meet the following requirements:
+   * * Each resource can have multiple labels, up to a maximum of 64.
+   * * Each label must be a key-value pair.
+   * * Keys have a minimum length of 1 character and a maximum length of 63
+   *   characters and cannot be empty. Values can be empty and have a maximum
+   *   length of 63 characters.
+   * * Keys and values can contain only lowercase letters, numeric characters,
+   *   underscores, and dashes. All characters must use UTF-8 encoding, and
+   *   international characters are allowed.
+   * * The key portion of a label must be unique. However, you can use the same
+   *   key with multiple resources.
+   * * Keys must start with a lowercase letter or international character.
+   * See [Google Cloud
+   * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+   * for more details.
+   * </pre>
+   *
+   * <code>map&lt;string, string&gt; user_labels = 8;</code>
+   */
+  @java.lang.Override
+  public boolean containsUserLabels(java.lang.String key) {
+    if (key == null) {
+      throw new NullPointerException("map key");
+    }
+    return internalGetUserLabels().getMap().containsKey(key);
+  }
+  /** Use {@link #getUserLabelsMap()} instead. */
+  @java.lang.Override
+  @java.lang.Deprecated
+  public java.util.Map<java.lang.String, java.lang.String> getUserLabels() {
+    return getUserLabelsMap();
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The user labels applied to a resource must meet the following requirements:
+   * * Each resource can have multiple labels, up to a maximum of 64.
+   * * Each label must be a key-value pair.
+   * * Keys have a minimum length of 1 character and a maximum length of 63
+   *   characters and cannot be empty. Values can be empty and have a maximum
+   *   length of 63 characters.
+   * * Keys and values can contain only lowercase letters, numeric characters,
+   *   underscores, and dashes. All characters must use UTF-8 encoding, and
+   *   international characters are allowed.
+   * * The key portion of a label must be unique. However, you can use the same
+   *   key with multiple resources.
+   * * Keys must start with a lowercase letter or international character.
+   * See [Google Cloud
+   * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+   * for more details.
+   * </pre>
+   *
+   * <code>map&lt;string, string&gt; user_labels = 8;</code>
+   */
+  @java.lang.Override
+  public java.util.Map<java.lang.String, java.lang.String> getUserLabelsMap() {
+    return internalGetUserLabels().getMap();
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The user labels applied to a resource must meet the following requirements:
+   * * Each resource can have multiple labels, up to a maximum of 64.
+   * * Each label must be a key-value pair.
+   * * Keys have a minimum length of 1 character and a maximum length of 63
+   *   characters and cannot be empty. Values can be empty and have a maximum
+   *   length of 63 characters.
+   * * Keys and values can contain only lowercase letters, numeric characters,
+   *   underscores, and dashes. All characters must use UTF-8 encoding, and
+   *   international characters are allowed.
+   * * The key portion of a label must be unique. However, you can use the same
+   *   key with multiple resources.
+   * * Keys must start with a lowercase letter or international character.
+   * See [Google Cloud
+   * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+   * for more details.
+   * </pre>
+   *
+   * <code>map&lt;string, string&gt; user_labels = 8;</code>
+   */
+  @java.lang.Override
+  public java.lang.String getUserLabelsOrDefault(
+      java.lang.String key, java.lang.String defaultValue) {
+    if (key == null) {
+      throw new NullPointerException("map key");
+    }
+    java.util.Map<java.lang.String, java.lang.String> map = internalGetUserLabels().getMap();
+    return map.containsKey(key) ? map.get(key) : defaultValue;
+  }
+  /**
+   *
+   *
+   * <pre>
+   * The user labels applied to a resource must meet the following requirements:
+   * * Each resource can have multiple labels, up to a maximum of 64.
+   * * Each label must be a key-value pair.
+   * * Keys have a minimum length of 1 character and a maximum length of 63
+   *   characters and cannot be empty. Values can be empty and have a maximum
+   *   length of 63 characters.
+   * * Keys and values can contain only lowercase letters, numeric characters,
+   *   underscores, and dashes. All characters must use UTF-8 encoding, and
+   *   international characters are allowed.
+   * * The key portion of a label must be unique. However, you can use the same
+   *   key with multiple resources.
+   * * Keys must start with a lowercase letter or international character.
+   * See [Google Cloud
+   * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+   * for more details.
+   * </pre>
+   *
+   * <code>map&lt;string, string&gt; user_labels = 8;</code>
+   */
+  @java.lang.Override
+  public java.lang.String getUserLabelsOrThrow(java.lang.String key) {
+    if (key == null) {
+      throw new NullPointerException("map key");
+    }
+    java.util.Map<java.lang.String, java.lang.String> map = internalGetUserLabels().getMap();
+    if (!map.containsKey(key)) {
+      throw new java.lang.IllegalArgumentException();
+    }
+    return map.get(key);
+  }
+
   private byte memoizedIsInitialized = -1;
 
   @java.lang.Override
@@ -566,6 +723,8 @@ public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io
     }
     com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
         output, internalGetParams(), ParamsDefaultEntryHolder.defaultEntry, 6);
+    com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
+        output, internalGetUserLabels(), UserLabelsDefaultEntryHolder.defaultEntry, 8);
     getUnknownFields().writeTo(output);
   }
 
@@ -600,6 +759,16 @@ public int getSerializedSize() {
               .build();
       size += com.google.protobuf.CodedOutputStream.computeMessageSize(6, params__);
     }
+    for (java.util.Map.Entry<java.lang.String, java.lang.String> entry :
+        internalGetUserLabels().getMap().entrySet()) {
+      com.google.protobuf.MapEntry<java.lang.String, java.lang.String> userLabels__ =
+          UserLabelsDefaultEntryHolder.defaultEntry
+              .newBuilderForType()
+              .setKey(entry.getKey())
+              .setValue(entry.getValue())
+              .build();
+      size += com.google.protobuf.CodedOutputStream.computeMessageSize(8, userLabels__);
+    }
     size += getUnknownFields().getSerializedSize();
     memoizedSize = size;
     return size;
@@ -625,6 +794,7 @@ public boolean equals(final java.lang.Object obj) {
     if (!getFilter().equals(other.getFilter())) return false;
     if (getValidateOnly() != other.getValidateOnly()) return false;
     if (!internalGetParams().equals(other.internalGetParams())) return false;
+    if (!internalGetUserLabels().equals(other.internalGetUserLabels())) return false;
     if (!getUnknownFields().equals(other.getUnknownFields())) return false;
     return true;
   }
@@ -652,6 +822,10 @@ public int hashCode() {
       hash = (37 * hash) + PARAMS_FIELD_NUMBER;
       hash = (53 * hash) + internalGetParams().hashCode();
     }
+    if (!internalGetUserLabels().getMap().isEmpty()) {
+      hash = (37 * hash) + USER_LABELS_FIELD_NUMBER;
+      hash = (53 * hash) + internalGetUserLabels().hashCode();
+    }
     hash = (29 * hash) + getUnknownFields().hashCode();
     memoizedHashCode = hash;
     return hash;
@@ -776,6 +950,8 @@ protected com.google.protobuf.MapField internalGetMapField(int number) {
       switch (number) {
         case 6:
           return internalGetParams();
+        case 8:
+          return internalGetUserLabels();
         default:
           throw new RuntimeException("Invalid map field number: " + number);
       }
@@ -786,6 +962,8 @@ protected com.google.protobuf.MapField internalGetMutableMapField(int number) {
       switch (number) {
         case 6:
           return internalGetMutableParams();
+        case 8:
+          return internalGetMutableUserLabels();
         default:
           throw new RuntimeException("Invalid map field number: " + number);
       }
@@ -826,6 +1004,7 @@ public Builder clear() {
       validateOnly_ = false;
 
       internalGetMutableParams().clear();
+      internalGetMutableUserLabels().clear();
       return this;
     }
 
@@ -865,6 +1044,8 @@ public com.google.cloud.discoveryengine.v1beta.RecommendRequest buildPartial() {
       result.validateOnly_ = validateOnly_;
       result.params_ = internalGetParams();
       result.params_.makeImmutable();
+      result.userLabels_ = internalGetUserLabels();
+      result.userLabels_.makeImmutable();
       onBuilt();
       return result;
     }
@@ -933,6 +1114,7 @@ public Builder mergeFrom(com.google.cloud.discoveryengine.v1beta.RecommendReques
         setValidateOnly(other.getValidateOnly());
       }
       internalGetMutableParams().mergeFrom(other.internalGetParams());
+      internalGetMutableUserLabels().mergeFrom(other.internalGetUserLabels());
       this.mergeUnknownFields(other.getUnknownFields());
       onChanged();
       return this;
@@ -1000,6 +1182,17 @@ public Builder mergeFrom(
                     .put(params__.getKey(), params__.getValue());
                 break;
               } // case 50
+            case 66:
+              {
+                com.google.protobuf.MapEntry<java.lang.String, java.lang.String> userLabels__ =
+                    input.readMessage(
+                        UserLabelsDefaultEntryHolder.defaultEntry.getParserForType(),
+                        extensionRegistry);
+                internalGetMutableUserLabels()
+                    .getMutableMap()
+                    .put(userLabels__.getKey(), userLabels__.getValue());
+                break;
+              } // case 66
             default:
               {
                 if (!super.parseUnknownField(input, extensionRegistry, tag)) {
@@ -2074,6 +2267,265 @@ public Builder putAllParams(java.util.Map<java.lang.String, com.google.protobuf.
       return this;
     }
 
+    private com.google.protobuf.MapField<java.lang.String, java.lang.String> userLabels_;
+
+    private com.google.protobuf.MapField<java.lang.String, java.lang.String>
+        internalGetUserLabels() {
+      if (userLabels_ == null) {
+        return com.google.protobuf.MapField.emptyMapField(
+            UserLabelsDefaultEntryHolder.defaultEntry);
+      }
+      return userLabels_;
+    }
+
+    private com.google.protobuf.MapField<java.lang.String, java.lang.String>
+        internalGetMutableUserLabels() {
+      onChanged();
+      ;
+      if (userLabels_ == null) {
+        userLabels_ =
+            com.google.protobuf.MapField.newMapField(UserLabelsDefaultEntryHolder.defaultEntry);
+      }
+      if (!userLabels_.isMutable()) {
+        userLabels_ = userLabels_.copy();
+      }
+      return userLabels_;
+    }
+
+    public int getUserLabelsCount() {
+      return internalGetUserLabels().getMap().size();
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The user labels applied to a resource must meet the following requirements:
+     * * Each resource can have multiple labels, up to a maximum of 64.
+     * * Each label must be a key-value pair.
+     * * Keys have a minimum length of 1 character and a maximum length of 63
+     *   characters and cannot be empty. Values can be empty and have a maximum
+     *   length of 63 characters.
+     * * Keys and values can contain only lowercase letters, numeric characters,
+     *   underscores, and dashes. All characters must use UTF-8 encoding, and
+     *   international characters are allowed.
+     * * The key portion of a label must be unique. However, you can use the same
+     *   key with multiple resources.
+     * * Keys must start with a lowercase letter or international character.
+     * See [Google Cloud
+     * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+     * for more details.
+     * </pre>
+     *
+     * <code>map&lt;string, string&gt; user_labels = 8;</code>
+     */
+    @java.lang.Override
+    public boolean containsUserLabels(java.lang.String key) {
+      if (key == null) {
+        throw new NullPointerException("map key");
+      }
+      return internalGetUserLabels().getMap().containsKey(key);
+    }
+    /** Use {@link #getUserLabelsMap()} instead. */
+    @java.lang.Override
+    @java.lang.Deprecated
+    public java.util.Map<java.lang.String, java.lang.String> getUserLabels() {
+      return getUserLabelsMap();
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The user labels applied to a resource must meet the following requirements:
+     * * Each resource can have multiple labels, up to a maximum of 64.
+     * * Each label must be a key-value pair.
+     * * Keys have a minimum length of 1 character and a maximum length of 63
+     *   characters and cannot be empty. Values can be empty and have a maximum
+     *   length of 63 characters.
+     * * Keys and values can contain only lowercase letters, numeric characters,
+     *   underscores, and dashes. All characters must use UTF-8 encoding, and
+     *   international characters are allowed.
+     * * The key portion of a label must be unique. However, you can use the same
+     *   key with multiple resources.
+     * * Keys must start with a lowercase letter or international character.
+     * See [Google Cloud
+     * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+     * for more details.
+     * </pre>
+     *
+     * <code>map&lt;string, string&gt; user_labels = 8;</code>
+     */
+    @java.lang.Override
+    public java.util.Map<java.lang.String, java.lang.String> getUserLabelsMap() {
+      return internalGetUserLabels().getMap();
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The user labels applied to a resource must meet the following requirements:
+     * * Each resource can have multiple labels, up to a maximum of 64.
+     * * Each label must be a key-value pair.
+     * * Keys have a minimum length of 1 character and a maximum length of 63
+     *   characters and cannot be empty. Values can be empty and have a maximum
+     *   length of 63 characters.
+     * * Keys and values can contain only lowercase letters, numeric characters,
+     *   underscores, and dashes. All characters must use UTF-8 encoding, and
+     *   international characters are allowed.
+     * * The key portion of a label must be unique. However, you can use the same
+     *   key with multiple resources.
+     * * Keys must start with a lowercase letter or international character.
+     * See [Google Cloud
+     * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+     * for more details.
+     * </pre>
+     *
+     * <code>map&lt;string, string&gt; user_labels = 8;</code>
+     */
+    @java.lang.Override
+    public java.lang.String getUserLabelsOrDefault(
+        java.lang.String key, java.lang.String defaultValue) {
+      if (key == null) {
+        throw new NullPointerException("map key");
+      }
+      java.util.Map<java.lang.String, java.lang.String> map = internalGetUserLabels().getMap();
+      return map.containsKey(key) ? map.get(key) : defaultValue;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The user labels applied to a resource must meet the following requirements:
+     * * Each resource can have multiple labels, up to a maximum of 64.
+     * * Each label must be a key-value pair.
+     * * Keys have a minimum length of 1 character and a maximum length of 63
+     *   characters and cannot be empty. Values can be empty and have a maximum
+     *   length of 63 characters.
+     * * Keys and values can contain only lowercase letters, numeric characters,
+     *   underscores, and dashes. All characters must use UTF-8 encoding, and
+     *   international characters are allowed.
+     * * The key portion of a label must be unique. However, you can use the same
+     *   key with multiple resources.
+     * * Keys must start with a lowercase letter or international character.
+     * See [Google Cloud
+     * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+     * for more details.
+     * </pre>
+     *
+     * <code>map&lt;string, string&gt; user_labels = 8;</code>
+     */
+    @java.lang.Override
+    public java.lang.String getUserLabelsOrThrow(java.lang.String key) {
+      if (key == null) {
+        throw new NullPointerException("map key");
+      }
+      java.util.Map<java.lang.String, java.lang.String> map = internalGetUserLabels().getMap();
+      if (!map.containsKey(key)) {
+        throw new java.lang.IllegalArgumentException();
+      }
+      return map.get(key);
+    }
+
+    public Builder clearUserLabels() {
+      internalGetMutableUserLabels().getMutableMap().clear();
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The user labels applied to a resource must meet the following requirements:
+     * * Each resource can have multiple labels, up to a maximum of 64.
+     * * Each label must be a key-value pair.
+     * * Keys have a minimum length of 1 character and a maximum length of 63
+     *   characters and cannot be empty. Values can be empty and have a maximum
+     *   length of 63 characters.
+     * * Keys and values can contain only lowercase letters, numeric characters,
+     *   underscores, and dashes. All characters must use UTF-8 encoding, and
+     *   international characters are allowed.
+     * * The key portion of a label must be unique. However, you can use the same
+     *   key with multiple resources.
+     * * Keys must start with a lowercase letter or international character.
+     * See [Google Cloud
+     * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+     * for more details.
+     * </pre>
+     *
+     * <code>map&lt;string, string&gt; user_labels = 8;</code>
+     */
+    public Builder removeUserLabels(java.lang.String key) {
+      if (key == null) {
+        throw new NullPointerException("map key");
+      }
+      internalGetMutableUserLabels().getMutableMap().remove(key);
+      return this;
+    }
+    /** Use alternate mutation accessors instead. */
+    @java.lang.Deprecated
+    public java.util.Map<java.lang.String, java.lang.String> getMutableUserLabels() {
+      return internalGetMutableUserLabels().getMutableMap();
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The user labels applied to a resource must meet the following requirements:
+     * * Each resource can have multiple labels, up to a maximum of 64.
+     * * Each label must be a key-value pair.
+     * * Keys have a minimum length of 1 character and a maximum length of 63
+     *   characters and cannot be empty. Values can be empty and have a maximum
+     *   length of 63 characters.
+     * * Keys and values can contain only lowercase letters, numeric characters,
+     *   underscores, and dashes. All characters must use UTF-8 encoding, and
+     *   international characters are allowed.
+     * * The key portion of a label must be unique. However, you can use the same
+     *   key with multiple resources.
+     * * Keys must start with a lowercase letter or international character.
+     * See [Google Cloud
+     * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+     * for more details.
+     * </pre>
+     *
+     * <code>map&lt;string, string&gt; user_labels = 8;</code>
+     */
+    public Builder putUserLabels(java.lang.String key, java.lang.String value) {
+      if (key == null) {
+        throw new NullPointerException("map key");
+      }
+      if (value == null) {
+        throw new NullPointerException("map value");
+      }
+
+      internalGetMutableUserLabels().getMutableMap().put(key, value);
+      return this;
+    }
+    /**
+     *
+     *
+     * <pre>
+     * The user labels applied to a resource must meet the following requirements:
+     * * Each resource can have multiple labels, up to a maximum of 64.
+     * * Each label must be a key-value pair.
+     * * Keys have a minimum length of 1 character and a maximum length of 63
+     *   characters and cannot be empty. Values can be empty and have a maximum
+     *   length of 63 characters.
+     * * Keys and values can contain only lowercase letters, numeric characters,
+     *   underscores, and dashes. All characters must use UTF-8 encoding, and
+     *   international characters are allowed.
+     * * The key portion of a label must be unique. However, you can use the same
+     *   key with multiple resources.
+     * * Keys must start with a lowercase letter or international character.
+     * See [Google Cloud
+     * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+     * for more details.
+     * </pre>
+     *
+     * <code>map&lt;string, string&gt; user_labels = 8;</code>
+     */
+    public Builder putAllUserLabels(java.util.Map<java.lang.String, java.lang.String> values) {
+      internalGetMutableUserLabels().getMutableMap().putAll(values);
+      return this;
+    }
+
     @java.lang.Override
     public final Builder setUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
       return super.setUnknownFields(unknownFields);
diff --git a/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendRequestOrBuilder.java b/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendRequestOrBuilder.java
index 9857949c0612..845394507c37 100644
--- a/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendRequestOrBuilder.java
+++ b/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendRequestOrBuilder.java
@@ -385,4 +385,133 @@ com.google.protobuf.Value getParamsOrDefault(
    * <code>map&lt;string, .google.protobuf.Value&gt; params = 6;</code>
    */
   com.google.protobuf.Value getParamsOrThrow(java.lang.String key);
+
+  /**
+   *
+   *
+   * <pre>
+   * The user labels applied to a resource must meet the following requirements:
+   * * Each resource can have multiple labels, up to a maximum of 64.
+   * * Each label must be a key-value pair.
+   * * Keys have a minimum length of 1 character and a maximum length of 63
+   *   characters and cannot be empty. Values can be empty and have a maximum
+   *   length of 63 characters.
+   * * Keys and values can contain only lowercase letters, numeric characters,
+   *   underscores, and dashes. All characters must use UTF-8 encoding, and
+   *   international characters are allowed.
+   * * The key portion of a label must be unique. However, you can use the same
+   *   key with multiple resources.
+   * * Keys must start with a lowercase letter or international character.
+   * See [Google Cloud
+   * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+   * for more details.
+   * </pre>
+   *
+   * <code>map&lt;string, string&gt; user_labels = 8;</code>
+   */
+  int getUserLabelsCount();
+  /**
+   *
+   *
+   * <pre>
+   * The user labels applied to a resource must meet the following requirements:
+   * * Each resource can have multiple labels, up to a maximum of 64.
+   * * Each label must be a key-value pair.
+   * * Keys have a minimum length of 1 character and a maximum length of 63
+   *   characters and cannot be empty. Values can be empty and have a maximum
+   *   length of 63 characters.
+   * * Keys and values can contain only lowercase letters, numeric characters,
+   *   underscores, and dashes. All characters must use UTF-8 encoding, and
+   *   international characters are allowed.
+   * * The key portion of a label must be unique. However, you can use the same
+   *   key with multiple resources.
+   * * Keys must start with a lowercase letter or international character.
+   * See [Google Cloud
+   * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+   * for more details.
+   * </pre>
+   *
+   * <code>map&lt;string, string&gt; user_labels = 8;</code>
+   */
+  boolean containsUserLabels(java.lang.String key);
+  /** Use {@link #getUserLabelsMap()} instead. */
+  @java.lang.Deprecated
+  java.util.Map<java.lang.String, java.lang.String> getUserLabels();
+  /**
+   *
+   *
+   * <pre>
+   * The user labels applied to a resource must meet the following requirements:
+   * * Each resource can have multiple labels, up to a maximum of 64.
+   * * Each label must be a key-value pair.
+   * * Keys have a minimum length of 1 character and a maximum length of 63
+   *   characters and cannot be empty. Values can be empty and have a maximum
+   *   length of 63 characters.
+   * * Keys and values can contain only lowercase letters, numeric characters,
+   *   underscores, and dashes. All characters must use UTF-8 encoding, and
+   *   international characters are allowed.
+   * * The key portion of a label must be unique. However, you can use the same
+   *   key with multiple resources.
+   * * Keys must start with a lowercase letter or international character.
+   * See [Google Cloud
+   * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+   * for more details.
+   * </pre>
+   *
+   * <code>map&lt;string, string&gt; user_labels = 8;</code>
+   */
+  java.util.Map<java.lang.String, java.lang.String> getUserLabelsMap();
+  /**
+   *
+   *
+   * <pre>
+   * The user labels applied to a resource must meet the following requirements:
+   * * Each resource can have multiple labels, up to a maximum of 64.
+   * * Each label must be a key-value pair.
+   * * Keys have a minimum length of 1 character and a maximum length of 63
+   *   characters and cannot be empty. Values can be empty and have a maximum
+   *   length of 63 characters.
+   * * Keys and values can contain only lowercase letters, numeric characters,
+   *   underscores, and dashes. All characters must use UTF-8 encoding, and
+   *   international characters are allowed.
+   * * The key portion of a label must be unique. However, you can use the same
+   *   key with multiple resources.
+   * * Keys must start with a lowercase letter or international character.
+   * See [Google Cloud
+   * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+   * for more details.
+   * </pre>
+   *
+   * <code>map&lt;string, string&gt; user_labels = 8;</code>
+   */
+
+  /* nullable */
+  java.lang.String getUserLabelsOrDefault(
+      java.lang.String key,
+      /* nullable */
+      java.lang.String defaultValue);
+  /**
+   *
+   *
+   * <pre>
+   * The user labels applied to a resource must meet the following requirements:
+   * * Each resource can have multiple labels, up to a maximum of 64.
+   * * Each label must be a key-value pair.
+   * * Keys have a minimum length of 1 character and a maximum length of 63
+   *   characters and cannot be empty. Values can be empty and have a maximum
+   *   length of 63 characters.
+   * * Keys and values can contain only lowercase letters, numeric characters,
+   *   underscores, and dashes. All characters must use UTF-8 encoding, and
+   *   international characters are allowed.
+   * * The key portion of a label must be unique. However, you can use the same
+   *   key with multiple resources.
+   * * Keys must start with a lowercase letter or international character.
+   * See [Google Cloud
+   * Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+   * for more details.
+   * </pre>
+   *
+   * <code>map&lt;string, string&gt; user_labels = 8;</code>
+   */
+  java.lang.String getUserLabelsOrThrow(java.lang.String key);
 }
diff --git a/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceProto.java b/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceProto.java
index 1476a5789e49..ae7cc877553a 100644
--- a/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceProto.java
+++ b/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/java/com/google/cloud/discoveryengine/v1beta/RecommendationServiceProto.java
@@ -35,6 +35,10 @@ public static void registerAllExtensions(com.google.protobuf.ExtensionRegistry r
       internal_static_google_cloud_discoveryengine_v1beta_RecommendRequest_ParamsEntry_descriptor;
   static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
       internal_static_google_cloud_discoveryengine_v1beta_RecommendRequest_ParamsEntry_fieldAccessorTable;
+  static final com.google.protobuf.Descriptors.Descriptor
+      internal_static_google_cloud_discoveryengine_v1beta_RecommendRequest_UserLabelsEntry_descriptor;
+  static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_google_cloud_discoveryengine_v1beta_RecommendRequest_UserLabelsEntry_fieldAccessorTable;
   static final com.google.protobuf.Descriptors.Descriptor
       internal_static_google_cloud_discoveryengine_v1beta_RecommendResponse_descriptor;
   static final com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
@@ -64,7 +68,7 @@ public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
           + "api/resource.proto\0322google/cloud/discove"
           + "ryengine/v1beta/document.proto\0324google/c"
           + "loud/discoveryengine/v1beta/user_event.p"
-          + "roto\032\034google/protobuf/struct.proto\"\375\002\n\020R"
+          + "roto\032\034google/protobuf/struct.proto\"\214\004\n\020R"
           + "ecommendRequest\022L\n\016serving_config\030\001 \001(\tB"
           + "4\340A\002\372A.\n,discoveryengine.googleapis.com/"
           + "ServingConfig\022G\n\nuser_event\030\002 \001(\0132..goog"
@@ -72,37 +76,40 @@ public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
           + "tB\003\340A\002\022\021\n\tpage_size\030\003 \001(\005\022\016\n\006filter\030\004 \001("
           + "\t\022\025\n\rvalidate_only\030\005 \001(\010\022Q\n\006params\030\006 \003(\013"
           + "2A.google.cloud.discoveryengine.v1beta.R"
-          + "ecommendRequest.ParamsEntry\032E\n\013ParamsEnt"
-          + "ry\022\013\n\003key\030\001 \001(\t\022%\n\005value\030\002 \001(\0132\026.google."
-          + "protobuf.Value:\0028\001\"\324\003\n\021RecommendResponse"
-          + "\022\\\n\007results\030\001 \003(\0132K.google.cloud.discove"
-          + "ryengine.v1beta.RecommendResponse.Recomm"
-          + "endationResult\022\031\n\021attribution_token\030\002 \001("
-          + "\t\022\023\n\013missing_ids\030\003 \003(\t\022\025\n\rvalidate_only\030"
-          + "\004 \001(\010\032\231\002\n\024RecommendationResult\022\n\n\002id\030\001 \001"
-          + "(\t\022?\n\010document\030\002 \001(\0132-.google.cloud.disc"
-          + "overyengine.v1beta.Document\022k\n\010metadata\030"
-          + "\003 \003(\0132Y.google.cloud.discoveryengine.v1b"
-          + "eta.RecommendResponse.RecommendationResu"
-          + "lt.MetadataEntry\032G\n\rMetadataEntry\022\013\n\003key"
-          + "\030\001 \001(\t\022%\n\005value\030\002 \001(\0132\026.google.protobuf."
-          + "Value:\0028\0012\314\002\n\025RecommendationService\022\336\001\n\t"
-          + "Recommend\0225.google.cloud.discoveryengine"
-          + ".v1beta.RecommendRequest\0326.google.cloud."
-          + "discoveryengine.v1beta.RecommendResponse"
-          + "\"b\202\323\344\223\002\\\"W/v1beta/{serving_config=projec"
-          + "ts/*/locations/*/dataStores/*/servingCon"
-          + "figs/*}:recommend:\001*\032R\312A\036discoveryengine"
-          + ".googleapis.com\322A.https://www.googleapis"
-          + ".com/auth/cloud-platformB\242\002\n\'com.google."
-          + "cloud.discoveryengine.v1betaB\032Recommenda"
-          + "tionServiceProtoP\001ZRgoogle.golang.org/ge"
-          + "nproto/googleapis/cloud/discoveryengine/"
-          + "v1beta;discoveryengine\242\002\017DISCOVERYENGINE"
-          + "\252\002#Google.Cloud.DiscoveryEngine.V1Beta\312\002"
-          + "#Google\\Cloud\\DiscoveryEngine\\V1beta\352\002&G"
-          + "oogle::Cloud::DiscoveryEngine::V1betab\006p"
-          + "roto3"
+          + "ecommendRequest.ParamsEntry\022Z\n\013user_labe"
+          + "ls\030\010 \003(\0132E.google.cloud.discoveryengine."
+          + "v1beta.RecommendRequest.UserLabelsEntry\032"
+          + "E\n\013ParamsEntry\022\013\n\003key\030\001 \001(\t\022%\n\005value\030\002 \001"
+          + "(\0132\026.google.protobuf.Value:\0028\001\0321\n\017UserLa"
+          + "belsEntry\022\013\n\003key\030\001 \001(\t\022\r\n\005value\030\002 \001(\t:\0028"
+          + "\001\"\324\003\n\021RecommendResponse\022\\\n\007results\030\001 \003(\013"
+          + "2K.google.cloud.discoveryengine.v1beta.R"
+          + "ecommendResponse.RecommendationResult\022\031\n"
+          + "\021attribution_token\030\002 \001(\t\022\023\n\013missing_ids\030"
+          + "\003 \003(\t\022\025\n\rvalidate_only\030\004 \001(\010\032\231\002\n\024Recomme"
+          + "ndationResult\022\n\n\002id\030\001 \001(\t\022?\n\010document\030\002 "
+          + "\001(\0132-.google.cloud.discoveryengine.v1bet"
+          + "a.Document\022k\n\010metadata\030\003 \003(\0132Y.google.cl"
+          + "oud.discoveryengine.v1beta.RecommendResp"
+          + "onse.RecommendationResult.MetadataEntry\032"
+          + "G\n\rMetadataEntry\022\013\n\003key\030\001 \001(\t\022%\n\005value\030\002"
+          + " \001(\0132\026.google.protobuf.Value:\0028\0012\314\002\n\025Rec"
+          + "ommendationService\022\336\001\n\tRecommend\0225.googl"
+          + "e.cloud.discoveryengine.v1beta.Recommend"
+          + "Request\0326.google.cloud.discoveryengine.v"
+          + "1beta.RecommendResponse\"b\202\323\344\223\002\\\"W/v1beta"
+          + "/{serving_config=projects/*/locations/*/"
+          + "dataStores/*/servingConfigs/*}:recommend"
+          + ":\001*\032R\312A\036discoveryengine.googleapis.com\322A"
+          + ".https://www.googleapis.com/auth/cloud-p"
+          + "latformB\242\002\n\'com.google.cloud.discoveryen"
+          + "gine.v1betaB\032RecommendationServiceProtoP"
+          + "\001ZRgoogle.golang.org/genproto/googleapis"
+          + "/cloud/discoveryengine/v1beta;discoverye"
+          + "ngine\242\002\017DISCOVERYENGINE\252\002#Google.Cloud.D"
+          + "iscoveryEngine.V1Beta\312\002#Google\\Cloud\\Dis"
+          + "coveryEngine\\V1beta\352\002&Google::Cloud::Dis"
+          + "coveryEngine::V1betab\006proto3"
     };
     descriptor =
         com.google.protobuf.Descriptors.FileDescriptor.internalBuildGeneratedFileFrom(
@@ -122,7 +129,13 @@ public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
         new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
             internal_static_google_cloud_discoveryengine_v1beta_RecommendRequest_descriptor,
             new java.lang.String[] {
-              "ServingConfig", "UserEvent", "PageSize", "Filter", "ValidateOnly", "Params",
+              "ServingConfig",
+              "UserEvent",
+              "PageSize",
+              "Filter",
+              "ValidateOnly",
+              "Params",
+              "UserLabels",
             });
     internal_static_google_cloud_discoveryengine_v1beta_RecommendRequest_ParamsEntry_descriptor =
         internal_static_google_cloud_discoveryengine_v1beta_RecommendRequest_descriptor
@@ -134,6 +147,16 @@ public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
             new java.lang.String[] {
               "Key", "Value",
             });
+    internal_static_google_cloud_discoveryengine_v1beta_RecommendRequest_UserLabelsEntry_descriptor =
+        internal_static_google_cloud_discoveryengine_v1beta_RecommendRequest_descriptor
+            .getNestedTypes()
+            .get(1);
+    internal_static_google_cloud_discoveryengine_v1beta_RecommendRequest_UserLabelsEntry_fieldAccessorTable =
+        new com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+            internal_static_google_cloud_discoveryengine_v1beta_RecommendRequest_UserLabelsEntry_descriptor,
+            new java.lang.String[] {
+              "Key", "Value",
+            });
     internal_static_google_cloud_discoveryengine_v1beta_RecommendResponse_descriptor =
         getDescriptor().getMessageTypes().get(1);
     internal_static_google_cloud_discoveryengine_v1beta_RecommendResponse_fieldAccessorTable =
diff --git a/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/proto/google/cloud/discoveryengine/v1beta/recommendation_service.proto b/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/proto/google/cloud/discoveryengine/v1beta/recommendation_service.proto
index 8efe0df37480..14304006ad33 100644
--- a/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/proto/google/cloud/discoveryengine/v1beta/recommendation_service.proto
+++ b/java-discoveryengine/proto-google-cloud-discoveryengine-v1beta/src/main/proto/google/cloud/discoveryengine/v1beta/recommendation_service.proto
@@ -137,6 +137,25 @@ message RecommendRequest {
   //    This gives request-level control and adjusts recommendation results
   //    based on Document category.
   map<string, google.protobuf.Value> params = 6;
+
+  // The user labels applied to a resource must meet the following requirements:
+  //
+  // * Each resource can have multiple labels, up to a maximum of 64.
+  // * Each label must be a key-value pair.
+  // * Keys have a minimum length of 1 character and a maximum length of 63
+  //   characters and cannot be empty. Values can be empty and have a maximum
+  //   length of 63 characters.
+  // * Keys and values can contain only lowercase letters, numeric characters,
+  //   underscores, and dashes. All characters must use UTF-8 encoding, and
+  //   international characters are allowed.
+  // * The key portion of a label must be unique. However, you can use the same
+  //   key with multiple resources.
+  // * Keys must start with a lowercase letter or international character.
+  //
+  // See [Google Cloud
+  // Document](https://cloud.google.com/resource-manager/docs/creating-managing-labels#requirements)
+  // for more details.
+  map<string, string> user_labels = 8;
 }
 
 // Response message for Recommend method.