diff --git a/Container/metadata/V1/ClusterService.php b/Container/metadata/V1/ClusterService.php
index 8240d9a39b77..a0fec97d577b 100644
--- a/Container/metadata/V1/ClusterService.php
+++ b/Container/metadata/V1/ClusterService.php
@@ -637,7 +637,7 @@ public static function initOnce() {
             "aa0219476f6f676c652e436c6f75642e436f6e7461696e65722e5631ca02" .
             "19476f6f676c655c436c6f75645c436f6e7461696e65725c563162067072" .
             "6f746f33"
-        ));
+        ), true);
 
         static::$is_initialized = true;
     }
diff --git a/Container/src/V1/Cluster/Status.php b/Container/src/V1/Cluster/Status.php
index 6be0fa10187d..5ab4c4cdd376 100644
--- a/Container/src/V1/Cluster/Status.php
+++ b/Container/src/V1/Cluster/Status.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Container\V1\Cluster;
 
+use UnexpectedValueException;
+
 /**
  * The current status of the cluster.
  *
@@ -58,6 +60,36 @@ class Status
      * Generated from protobuf enum <code>DEGRADED = 6;</code>
      */
     const DEGRADED = 6;
+
+    private static $valueToName = [
+        self::STATUS_UNSPECIFIED => 'STATUS_UNSPECIFIED',
+        self::PROVISIONING => 'PROVISIONING',
+        self::RUNNING => 'RUNNING',
+        self::RECONCILING => 'RECONCILING',
+        self::STOPPING => 'STOPPING',
+        self::ERROR => 'ERROR',
+        self::DEGRADED => 'DEGRADED',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
 }
 
 // Adding a class alias for backwards compatibility with the previous class name.
diff --git a/Container/src/V1/NetworkPolicy/Provider.php b/Container/src/V1/NetworkPolicy/Provider.php
index 460a8c70d626..ec0b75a7993d 100644
--- a/Container/src/V1/NetworkPolicy/Provider.php
+++ b/Container/src/V1/NetworkPolicy/Provider.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Container\V1\NetworkPolicy;
 
+use UnexpectedValueException;
+
 /**
  * Allowed Network Policy providers.
  *
@@ -23,6 +25,31 @@ class Provider
      * Generated from protobuf enum <code>CALICO = 1;</code>
      */
     const CALICO = 1;
+
+    private static $valueToName = [
+        self::PROVIDER_UNSPECIFIED => 'PROVIDER_UNSPECIFIED',
+        self::CALICO => 'CALICO',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
 }
 
 // Adding a class alias for backwards compatibility with the previous class name.
diff --git a/Container/src/V1/NodePool/Status.php b/Container/src/V1/NodePool/Status.php
index e19adc8aaf61..76d3391edf7d 100644
--- a/Container/src/V1/NodePool/Status.php
+++ b/Container/src/V1/NodePool/Status.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Container\V1\NodePool;
 
+use UnexpectedValueException;
+
 /**
  * The current status of the node pool instance.
  *
@@ -60,6 +62,36 @@ class Status
      * Generated from protobuf enum <code>ERROR = 6;</code>
      */
     const ERROR = 6;
+
+    private static $valueToName = [
+        self::STATUS_UNSPECIFIED => 'STATUS_UNSPECIFIED',
+        self::PROVISIONING => 'PROVISIONING',
+        self::RUNNING => 'RUNNING',
+        self::RUNNING_WITH_ERROR => 'RUNNING_WITH_ERROR',
+        self::RECONCILING => 'RECONCILING',
+        self::STOPPING => 'STOPPING',
+        self::ERROR => 'ERROR',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
 }
 
 // Adding a class alias for backwards compatibility with the previous class name.
diff --git a/Container/src/V1/Operation/Status.php b/Container/src/V1/Operation/Status.php
index 34d28751a3af..49c8585d1851 100644
--- a/Container/src/V1/Operation/Status.php
+++ b/Container/src/V1/Operation/Status.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Container\V1\Operation;
 
+use UnexpectedValueException;
+
 /**
  * Current status of the operation.
  *
@@ -41,6 +43,34 @@ class Status
      * Generated from protobuf enum <code>ABORTING = 4;</code>
      */
     const ABORTING = 4;
+
+    private static $valueToName = [
+        self::STATUS_UNSPECIFIED => 'STATUS_UNSPECIFIED',
+        self::PENDING => 'PENDING',
+        self::RUNNING => 'RUNNING',
+        self::DONE => 'DONE',
+        self::ABORTING => 'ABORTING',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
 }
 
 // Adding a class alias for backwards compatibility with the previous class name.
diff --git a/Container/src/V1/Operation/Type.php b/Container/src/V1/Operation/Type.php
index 26f085d68ff1..4992d7cf2186 100644
--- a/Container/src/V1/Operation/Type.php
+++ b/Container/src/V1/Operation/Type.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Container\V1\Operation;
 
+use UnexpectedValueException;
+
 /**
  * Operation type.
  *
@@ -113,6 +115,46 @@ class Type
      * Generated from protobuf enum <code>SET_MAINTENANCE_POLICY = 16;</code>
      */
     const SET_MAINTENANCE_POLICY = 16;
+
+    private static $valueToName = [
+        self::TYPE_UNSPECIFIED => 'TYPE_UNSPECIFIED',
+        self::CREATE_CLUSTER => 'CREATE_CLUSTER',
+        self::DELETE_CLUSTER => 'DELETE_CLUSTER',
+        self::UPGRADE_MASTER => 'UPGRADE_MASTER',
+        self::UPGRADE_NODES => 'UPGRADE_NODES',
+        self::REPAIR_CLUSTER => 'REPAIR_CLUSTER',
+        self::UPDATE_CLUSTER => 'UPDATE_CLUSTER',
+        self::CREATE_NODE_POOL => 'CREATE_NODE_POOL',
+        self::DELETE_NODE_POOL => 'DELETE_NODE_POOL',
+        self::SET_NODE_POOL_MANAGEMENT => 'SET_NODE_POOL_MANAGEMENT',
+        self::AUTO_REPAIR_NODES => 'AUTO_REPAIR_NODES',
+        self::AUTO_UPGRADE_NODES => 'AUTO_UPGRADE_NODES',
+        self::SET_LABELS => 'SET_LABELS',
+        self::SET_MASTER_AUTH => 'SET_MASTER_AUTH',
+        self::SET_NODE_POOL_SIZE => 'SET_NODE_POOL_SIZE',
+        self::SET_NETWORK_POLICY => 'SET_NETWORK_POLICY',
+        self::SET_MAINTENANCE_POLICY => 'SET_MAINTENANCE_POLICY',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
 }
 
 // Adding a class alias for backwards compatibility with the previous class name.
diff --git a/Container/src/V1/SetMasterAuthRequest/Action.php b/Container/src/V1/SetMasterAuthRequest/Action.php
index 103fd2fa49cd..f05c2c752248 100644
--- a/Container/src/V1/SetMasterAuthRequest/Action.php
+++ b/Container/src/V1/SetMasterAuthRequest/Action.php
@@ -4,6 +4,8 @@
 
 namespace Google\Cloud\Container\V1\SetMasterAuthRequest;
 
+use UnexpectedValueException;
+
 /**
  * Operation type: what type update to perform.
  *
@@ -38,6 +40,33 @@ class Action
      * Generated from protobuf enum <code>SET_USERNAME = 3;</code>
      */
     const SET_USERNAME = 3;
+
+    private static $valueToName = [
+        self::UNKNOWN => 'UNKNOWN',
+        self::SET_PASSWORD => 'SET_PASSWORD',
+        self::GENERATE_PASSWORD => 'GENERATE_PASSWORD',
+        self::SET_USERNAME => 'SET_USERNAME',
+    ];
+
+    public static function name($value)
+    {
+        if (!isset(self::$valueToName[$value])) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no name defined for value %s', __CLASS__, $value));
+        }
+        return self::$valueToName[$value];
+    }
+
+
+    public static function value($name)
+    {
+        $const = __CLASS__ . '::' . strtoupper($name);
+        if (!defined($const)) {
+            throw new UnexpectedValueException(sprintf(
+                    'Enum %s has no value defined for name %s', __CLASS__, $name));
+        }
+        return constant($const);
+    }
 }
 
 // Adding a class alias for backwards compatibility with the previous class name.
diff --git a/Container/synth.metadata b/Container/synth.metadata
index dbe260e8c2aa..1c4e2dee1ccf 100644
--- a/Container/synth.metadata
+++ b/Container/synth.metadata
@@ -1,19 +1,19 @@
 {
-  "updateTime": "2019-03-28T09:59:19.575594Z",
+  "updateTime": "2019-03-29T09:59:16.145267Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "0.16.20",
-        "dockerImage": "googleapis/artman@sha256:e3c054a2fb85a12481c722af616c7fb6f1d02d862248385eecbec3e4240ebd1e"
+        "version": "0.16.21",
+        "dockerImage": "googleapis/artman@sha256:854131ec1af7b3a313253474c24748dc0acd217a58a0b74dbfb559f340a15d78"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "6a84b3267b0a95e922608b9891219075047eee29",
-        "internalRef": "240640999"
+        "sha": "37386f1ebcaed51bcb7d15d00124d22c38606e45",
+        "internalRef": "240841842"
       }
     }
   ],