diff --git a/AlloyDb/metadata/V1/Service.php b/AlloyDb/metadata/V1/Service.php
index 25fefab0cca3..238c970fac62 100644
Binary files a/AlloyDb/metadata/V1/Service.php and b/AlloyDb/metadata/V1/Service.php differ
diff --git a/AlloyDb/src/V1/Cluster/NetworkConfig.php b/AlloyDb/src/V1/Cluster/NetworkConfig.php
index 579ed767a6b8..38e319e5da18 100644
--- a/AlloyDb/src/V1/Cluster/NetworkConfig.php
+++ b/AlloyDb/src/V1/Cluster/NetworkConfig.php
@@ -32,8 +32,8 @@ class NetworkConfig extends \Google\Protobuf\Internal\Message
      * instance IPs for this cluster will be created in the allocated range. The
      * range name must comply with RFC 1035. Specifically, the name must be 1-63
      * characters long and match the regular expression
-     * [a-z]([-a-z0-9]*[a-z0-9])?.
-     * Field name is intended to be consistent with CloudSQL.
+     * `[a-z]([-a-z0-9]*[a-z0-9])?`.
+     * Field name is intended to be consistent with Cloud SQL.
      *
      * Generated from protobuf field <code>string allocated_ip_range = 2 [(.google.api.field_behavior) = OPTIONAL];</code>
      */
@@ -58,8 +58,8 @@ class NetworkConfig extends \Google\Protobuf\Internal\Message
      *           instance IPs for this cluster will be created in the allocated range. The
      *           range name must comply with RFC 1035. Specifically, the name must be 1-63
      *           characters long and match the regular expression
-     *           [a-z]([-a-z0-9]*[a-z0-9])?.
-     *           Field name is intended to be consistent with CloudSQL.
+     *           `[a-z]([-a-z0-9]*[a-z0-9])?`.
+     *           Field name is intended to be consistent with Cloud SQL.
      * }
      */
     public function __construct($data = NULL) {
@@ -109,8 +109,8 @@ public function setNetwork($var)
      * instance IPs for this cluster will be created in the allocated range. The
      * range name must comply with RFC 1035. Specifically, the name must be 1-63
      * characters long and match the regular expression
-     * [a-z]([-a-z0-9]*[a-z0-9])?.
-     * Field name is intended to be consistent with CloudSQL.
+     * `[a-z]([-a-z0-9]*[a-z0-9])?`.
+     * Field name is intended to be consistent with Cloud SQL.
      *
      * Generated from protobuf field <code>string allocated_ip_range = 2 [(.google.api.field_behavior) = OPTIONAL];</code>
      * @return string
@@ -126,8 +126,8 @@ public function getAllocatedIpRange()
      * instance IPs for this cluster will be created in the allocated range. The
      * range name must comply with RFC 1035. Specifically, the name must be 1-63
      * characters long and match the regular expression
-     * [a-z]([-a-z0-9]*[a-z0-9])?.
-     * Field name is intended to be consistent with CloudSQL.
+     * `[a-z]([-a-z0-9]*[a-z0-9])?`.
+     * Field name is intended to be consistent with Cloud SQL.
      *
      * Generated from protobuf field <code>string allocated_ip_range = 2 [(.google.api.field_behavior) = OPTIONAL];</code>
      * @param string $var
diff --git a/AlloyDb/src/V1/Gapic/AlloyDBAdminGapicClient.php b/AlloyDb/src/V1/Gapic/AlloyDBAdminGapicClient.php
index abb9bad6dcbb..ebe3d7f72464 100644
--- a/AlloyDb/src/V1/Gapic/AlloyDBAdminGapicClient.php
+++ b/AlloyDb/src/V1/Gapic/AlloyDBAdminGapicClient.php
@@ -1869,6 +1869,10 @@ public function failoverInstance($name, array $optionalArgs = [])
      *           default duration.
      *     @type string $publicKey
      *           Optional. The public key from the client.
+     *     @type bool $useMetadataExchange
+     *           Optional. An optional hint to the endpoint to generate a client
+     *           ceritificate that can be used by AlloyDB connectors to exchange additional
+     *           metadata with the server after TLS handshake.
      *     @type RetrySettings|array $retrySettings
      *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
      *           associative array of retry settings parameters. See the documentation on
@@ -1897,6 +1901,12 @@ public function generateClientCertificate($parent, array $optionalArgs = [])
             $request->setPublicKey($optionalArgs['publicKey']);
         }
 
+        if (isset($optionalArgs['useMetadataExchange'])) {
+            $request->setUseMetadataExchange(
+                $optionalArgs['useMetadataExchange']
+            );
+        }
+
         $requestParams = new RequestParamsHeaderDescriptor(
             $requestParamHeaders
         );
diff --git a/AlloyDb/src/V1/GenerateClientCertificateRequest.php b/AlloyDb/src/V1/GenerateClientCertificateRequest.php
index 96e33e2dc263..a66f9ccd2a1a 100644
--- a/AlloyDb/src/V1/GenerateClientCertificateRequest.php
+++ b/AlloyDb/src/V1/GenerateClientCertificateRequest.php
@@ -55,6 +55,14 @@ class GenerateClientCertificateRequest extends \Google\Protobuf\Internal\Message
      * Generated from protobuf field <code>string public_key = 5 [(.google.api.field_behavior) = OPTIONAL];</code>
      */
     protected $public_key = '';
+    /**
+     * Optional. An optional hint to the endpoint to generate a client
+     * ceritificate that can be used by AlloyDB connectors to exchange additional
+     * metadata with the server after TLS handshake.
+     *
+     * Generated from protobuf field <code>bool use_metadata_exchange = 6 [(.google.api.field_behavior) = OPTIONAL];</code>
+     */
+    protected $use_metadata_exchange = false;
 
     /**
      * @param string $parent Required. The name of the parent resource. The required format is:
@@ -100,6 +108,10 @@ public static function build(string $parent): self
      *           default duration.
      *     @type string $public_key
      *           Optional. The public key from the client.
+     *     @type bool $use_metadata_exchange
+     *           Optional. An optional hint to the endpoint to generate a client
+     *           ceritificate that can be used by AlloyDB connectors to exchange additional
+     *           metadata with the server after TLS handshake.
      * }
      */
     public function __construct($data = NULL) {
@@ -251,5 +263,35 @@ public function setPublicKey($var)
         return $this;
     }
 
+    /**
+     * Optional. An optional hint to the endpoint to generate a client
+     * ceritificate that can be used by AlloyDB connectors to exchange additional
+     * metadata with the server after TLS handshake.
+     *
+     * Generated from protobuf field <code>bool use_metadata_exchange = 6 [(.google.api.field_behavior) = OPTIONAL];</code>
+     * @return bool
+     */
+    public function getUseMetadataExchange()
+    {
+        return $this->use_metadata_exchange;
+    }
+
+    /**
+     * Optional. An optional hint to the endpoint to generate a client
+     * ceritificate that can be used by AlloyDB connectors to exchange additional
+     * metadata with the server after TLS handshake.
+     *
+     * Generated from protobuf field <code>bool use_metadata_exchange = 6 [(.google.api.field_behavior) = OPTIONAL];</code>
+     * @param bool $var
+     * @return $this
+     */
+    public function setUseMetadataExchange($var)
+    {
+        GPBUtil::checkBool($var);
+        $this->use_metadata_exchange = $var;
+
+        return $this;
+    }
+
 }
 
diff --git a/AlloyDb/src/V1/Instance.php b/AlloyDb/src/V1/Instance.php
index c0ce05d48fb0..8a5e4930c841 100644
--- a/AlloyDb/src/V1/Instance.php
+++ b/AlloyDb/src/V1/Instance.php
@@ -146,7 +146,8 @@ class Instance extends \Google\Protobuf\Internal\Message
      */
     protected $query_insights_config = null;
     /**
-     * Read pool specific config.
+     * Read pool instance configuration.
+     * This is required if the value of instanceType is READ_POOL.
      *
      * Generated from protobuf field <code>.google.cloud.alloydb.v1.Instance.ReadPoolConfig read_pool_config = 14;</code>
      */
@@ -261,7 +262,8 @@ class Instance extends \Google\Protobuf\Internal\Message
      *     @type \Google\Cloud\AlloyDb\V1\Instance\QueryInsightsInstanceConfig $query_insights_config
      *           Configuration for query insights.
      *     @type \Google\Cloud\AlloyDb\V1\Instance\ReadPoolConfig $read_pool_config
-     *           Read pool specific config.
+     *           Read pool instance configuration.
+     *           This is required if the value of instanceType is READ_POOL.
      *     @type string $ip_address
      *           Output only. The IP address for the Instance.
      *           This is the connection endpoint for an end-user application.
@@ -829,7 +831,8 @@ public function setQueryInsightsConfig($var)
     }
 
     /**
-     * Read pool specific config.
+     * Read pool instance configuration.
+     * This is required if the value of instanceType is READ_POOL.
      *
      * Generated from protobuf field <code>.google.cloud.alloydb.v1.Instance.ReadPoolConfig read_pool_config = 14;</code>
      * @return \Google\Cloud\AlloyDb\V1\Instance\ReadPoolConfig|null
@@ -850,7 +853,8 @@ public function clearReadPoolConfig()
     }
 
     /**
-     * Read pool specific config.
+     * Read pool instance configuration.
+     * This is required if the value of instanceType is READ_POOL.
      *
      * Generated from protobuf field <code>.google.cloud.alloydb.v1.Instance.ReadPoolConfig read_pool_config = 14;</code>
      * @param \Google\Cloud\AlloyDb\V1\Instance\ReadPoolConfig $var