diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/FlexTemplatesServiceClient.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/FlexTemplatesServiceClient.java
index f72b18f03fdc..3ce5dae05d10 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/FlexTemplatesServiceClient.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/FlexTemplatesServiceClient.java
@@ -33,8 +33,11 @@
  * 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 (FlexTemplatesServiceClient flexTemplatesServiceClient =
  *     FlexTemplatesServiceClient.create()) {
  *   LaunchFlexTemplateRequest request =
@@ -78,8 +81,11 @@
  * <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
  * FlexTemplatesServiceSettings flexTemplatesServiceSettings =
  *     FlexTemplatesServiceSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -91,8 +97,11 @@
  * <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
  * FlexTemplatesServiceSettings flexTemplatesServiceSettings =
  *     FlexTemplatesServiceSettings.newBuilder().setEndpoint(myEndpoint).build();
  * FlexTemplatesServiceClient flexTemplatesServiceClient =
@@ -103,8 +112,11 @@
  * 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
  * FlexTemplatesServiceSettings flexTemplatesServiceSettings =
  *     FlexTemplatesServiceSettings.newBuilder()
  *         .setTransportChannelProvider(
@@ -174,8 +186,11 @@ public FlexTemplatesServiceStub 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 (FlexTemplatesServiceClient flexTemplatesServiceClient =
    *     FlexTemplatesServiceClient.create()) {
    *   LaunchFlexTemplateRequest request =
@@ -203,8 +218,11 @@ public final LaunchFlexTemplateResponse launchFlexTemplate(LaunchFlexTemplateReq
    * <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 (FlexTemplatesServiceClient flexTemplatesServiceClient =
    *     FlexTemplatesServiceClient.create()) {
    *   LaunchFlexTemplateRequest request =
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/FlexTemplatesServiceSettings.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/FlexTemplatesServiceSettings.java
index b2ca423f4564..9cef76ee8069 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/FlexTemplatesServiceSettings.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/FlexTemplatesServiceSettings.java
@@ -50,8 +50,11 @@
  * <p>For example, to set the total timeout of launchFlexTemplate 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
  * FlexTemplatesServiceSettings.Builder flexTemplatesServiceSettingsBuilder =
  *     FlexTemplatesServiceSettings.newBuilder();
  * flexTemplatesServiceSettingsBuilder
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/JobsV1Beta3Client.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/JobsV1Beta3Client.java
index 9f68f185aa60..d90ee613e839 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/JobsV1Beta3Client.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/JobsV1Beta3Client.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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
  *   CreateJobRequest request =
  *       CreateJobRequest.newBuilder()
@@ -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
  * JobsV1Beta3Settings jobsV1Beta3Settings =
  *     JobsV1Beta3Settings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -98,8 +104,11 @@
  * <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
  * JobsV1Beta3Settings jobsV1Beta3Settings =
  *     JobsV1Beta3Settings.newBuilder().setEndpoint(myEndpoint).build();
  * JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create(jobsV1Beta3Settings);
@@ -109,8 +118,11 @@
  * 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
  * JobsV1Beta3Settings jobsV1Beta3Settings =
  *     JobsV1Beta3Settings.newBuilder()
  *         .setTransportChannelProvider(
@@ -182,8 +194,11 @@ public JobsV1Beta3Stub 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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   CreateJobRequest request =
    *       CreateJobRequest.newBuilder()
@@ -215,8 +230,11 @@ public final Job createJob(CreateJobRequest 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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   CreateJobRequest request =
    *       CreateJobRequest.newBuilder()
@@ -248,8 +266,11 @@ public final UnaryCallable<CreateJobRequest, Job> createJobCallable() {
    * <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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   GetJobRequest request =
    *       GetJobRequest.newBuilder()
@@ -281,8 +302,11 @@ public final Job getJob(GetJobRequest 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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   GetJobRequest request =
    *       GetJobRequest.newBuilder()
@@ -314,8 +338,11 @@ public final UnaryCallable<GetJobRequest, Job> getJobCallable() {
    * <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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   UpdateJobRequest request =
    *       UpdateJobRequest.newBuilder()
@@ -348,8 +375,11 @@ public final Job updateJob(UpdateJobRequest 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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   UpdateJobRequest request =
    *       UpdateJobRequest.newBuilder()
@@ -381,8 +411,11 @@ public final UnaryCallable<UpdateJobRequest, Job> updateJobCallable() {
    * <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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   ListJobsRequest request =
    *       ListJobsRequest.newBuilder()
@@ -418,8 +451,11 @@ public final ListJobsPagedResponse listJobs(ListJobsRequest 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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   ListJobsRequest request =
    *       ListJobsRequest.newBuilder()
@@ -454,8 +490,11 @@ public final UnaryCallable<ListJobsRequest, ListJobsPagedResponse> listJobsPaged
    * <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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   ListJobsRequest request =
    *       ListJobsRequest.newBuilder()
@@ -491,8 +530,11 @@ public final UnaryCallable<ListJobsRequest, ListJobsResponse> listJobsCallable()
    * <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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   ListJobsRequest request =
    *       ListJobsRequest.newBuilder()
@@ -522,8 +564,11 @@ public final AggregatedListJobsPagedResponse aggregatedListJobs(ListJobsRequest
    * <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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   ListJobsRequest request =
    *       ListJobsRequest.newBuilder()
@@ -554,8 +599,11 @@ public final AggregatedListJobsPagedResponse aggregatedListJobs(ListJobsRequest
    * <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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   ListJobsRequest request =
    *       ListJobsRequest.newBuilder()
@@ -591,8 +639,11 @@ public final UnaryCallable<ListJobsRequest, ListJobsResponse> aggregatedListJobs
    * <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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   CheckActiveJobsRequest request =
    *       CheckActiveJobsRequest.newBuilder().setProjectId("projectId-894832108").build();
@@ -614,8 +665,11 @@ public final CheckActiveJobsResponse checkActiveJobs(CheckActiveJobsRequest requ
    * <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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   CheckActiveJobsRequest request =
    *       CheckActiveJobsRequest.newBuilder().setProjectId("projectId-894832108").build();
@@ -638,8 +692,11 @@ public final CheckActiveJobsResponse checkActiveJobs(CheckActiveJobsRequest requ
    * <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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   SnapshotJobRequest request =
    *       SnapshotJobRequest.newBuilder()
@@ -668,8 +725,11 @@ public final Snapshot snapshotJob(SnapshotJobRequest 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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
    *   SnapshotJobRequest request =
    *       SnapshotJobRequest.newBuilder()
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/JobsV1Beta3Settings.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/JobsV1Beta3Settings.java
index 446021d6d028..83889491c9f0 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/JobsV1Beta3Settings.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/JobsV1Beta3Settings.java
@@ -54,16 +54,16 @@
  * <p>For example, to set the total timeout of createJob 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
  * JobsV1Beta3Settings.Builder jobsV1Beta3SettingsBuilder = JobsV1Beta3Settings.newBuilder();
  * jobsV1Beta3SettingsBuilder
  *     .createJobSettings()
  *     .setRetrySettings(
- *         jobsV1Beta3SettingsBuilder
- *             .createJobSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         jobsV1Beta3SettingsBuilder.createJobSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * JobsV1Beta3Settings jobsV1Beta3Settings = jobsV1Beta3SettingsBuilder.build();
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MessagesV1Beta3Client.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MessagesV1Beta3Client.java
index b5731c909a15..5d36aafacc73 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MessagesV1Beta3Client.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MessagesV1Beta3Client.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 (MessagesV1Beta3Client messagesV1Beta3Client = MessagesV1Beta3Client.create()) {
  *   ListJobMessagesRequest request =
  *       ListJobMessagesRequest.newBuilder()
@@ -92,8 +95,11 @@
  * <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
  * MessagesV1Beta3Settings messagesV1Beta3Settings =
  *     MessagesV1Beta3Settings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -105,8 +111,11 @@
  * <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
  * MessagesV1Beta3Settings messagesV1Beta3Settings =
  *     MessagesV1Beta3Settings.newBuilder().setEndpoint(myEndpoint).build();
  * MessagesV1Beta3Client messagesV1Beta3Client =
@@ -117,8 +126,11 @@
  * 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
  * MessagesV1Beta3Settings messagesV1Beta3Settings =
  *     MessagesV1Beta3Settings.newBuilder()
  *         .setTransportChannelProvider(
@@ -194,8 +206,11 @@ public MessagesV1Beta3Stub 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 (MessagesV1Beta3Client messagesV1Beta3Client = MessagesV1Beta3Client.create()) {
    *   ListJobMessagesRequest request =
    *       ListJobMessagesRequest.newBuilder()
@@ -234,8 +249,11 @@ public final ListJobMessagesPagedResponse listJobMessages(ListJobMessagesRequest
    * <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 (MessagesV1Beta3Client messagesV1Beta3Client = MessagesV1Beta3Client.create()) {
    *   ListJobMessagesRequest request =
    *       ListJobMessagesRequest.newBuilder()
@@ -275,8 +293,11 @@ public final ListJobMessagesPagedResponse listJobMessages(ListJobMessagesRequest
    * <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 (MessagesV1Beta3Client messagesV1Beta3Client = MessagesV1Beta3Client.create()) {
    *   ListJobMessagesRequest request =
    *       ListJobMessagesRequest.newBuilder()
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MessagesV1Beta3Settings.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MessagesV1Beta3Settings.java
index 12e0c7794a97..039ce8b329ed 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MessagesV1Beta3Settings.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MessagesV1Beta3Settings.java
@@ -53,17 +53,17 @@
  * <p>For example, to set the total timeout of listJobMessages 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
  * MessagesV1Beta3Settings.Builder messagesV1Beta3SettingsBuilder =
  *     MessagesV1Beta3Settings.newBuilder();
  * messagesV1Beta3SettingsBuilder
  *     .listJobMessagesSettings()
  *     .setRetrySettings(
- *         messagesV1Beta3SettingsBuilder
- *             .listJobMessagesSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         messagesV1Beta3SettingsBuilder.listJobMessagesSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * MessagesV1Beta3Settings messagesV1Beta3Settings = messagesV1Beta3SettingsBuilder.build();
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MetricsV1Beta3Client.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MetricsV1Beta3Client.java
index dd56120e4d5e..8c0ef99bb29e 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MetricsV1Beta3Client.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MetricsV1Beta3Client.java
@@ -41,8 +41,11 @@
  * 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 (MetricsV1Beta3Client metricsV1Beta3Client = MetricsV1Beta3Client.create()) {
  *   GetJobMetricsRequest request =
  *       GetJobMetricsRequest.newBuilder()
@@ -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
  * MetricsV1Beta3Settings metricsV1Beta3Settings =
  *     MetricsV1Beta3Settings.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
  * MetricsV1Beta3Settings metricsV1Beta3Settings =
  *     MetricsV1Beta3Settings.newBuilder().setEndpoint(myEndpoint).build();
  * MetricsV1Beta3Client metricsV1Beta3Client = MetricsV1Beta3Client.create(metricsV1Beta3Settings);
@@ -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
  * MetricsV1Beta3Settings metricsV1Beta3Settings =
  *     MetricsV1Beta3Settings.newBuilder()
  *         .setTransportChannelProvider(
@@ -182,8 +194,11 @@ public MetricsV1Beta3Stub 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 (MetricsV1Beta3Client metricsV1Beta3Client = MetricsV1Beta3Client.create()) {
    *   GetJobMetricsRequest request =
    *       GetJobMetricsRequest.newBuilder()
@@ -215,8 +230,11 @@ public final JobMetrics getJobMetrics(GetJobMetricsRequest 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 (MetricsV1Beta3Client metricsV1Beta3Client = MetricsV1Beta3Client.create()) {
    *   GetJobMetricsRequest request =
    *       GetJobMetricsRequest.newBuilder()
@@ -245,8 +263,11 @@ public final UnaryCallable<GetJobMetricsRequest, JobMetrics> getJobMetricsCallab
    * <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 (MetricsV1Beta3Client metricsV1Beta3Client = MetricsV1Beta3Client.create()) {
    *   GetJobExecutionDetailsRequest request =
    *       GetJobExecutionDetailsRequest.newBuilder()
@@ -280,8 +301,11 @@ public final GetJobExecutionDetailsPagedResponse getJobExecutionDetails(
    * <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 (MetricsV1Beta3Client metricsV1Beta3Client = MetricsV1Beta3Client.create()) {
    *   GetJobExecutionDetailsRequest request =
    *       GetJobExecutionDetailsRequest.newBuilder()
@@ -314,8 +338,11 @@ public final GetJobExecutionDetailsPagedResponse getJobExecutionDetails(
    * <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 (MetricsV1Beta3Client metricsV1Beta3Client = MetricsV1Beta3Client.create()) {
    *   GetJobExecutionDetailsRequest request =
    *       GetJobExecutionDetailsRequest.newBuilder()
@@ -355,8 +382,11 @@ public final GetJobExecutionDetailsPagedResponse getJobExecutionDetails(
    * <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 (MetricsV1Beta3Client metricsV1Beta3Client = MetricsV1Beta3Client.create()) {
    *   GetStageExecutionDetailsRequest request =
    *       GetStageExecutionDetailsRequest.newBuilder()
@@ -393,8 +423,11 @@ public final GetStageExecutionDetailsPagedResponse getStageExecutionDetails(
    * <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 (MetricsV1Beta3Client metricsV1Beta3Client = MetricsV1Beta3Client.create()) {
    *   GetStageExecutionDetailsRequest request =
    *       GetStageExecutionDetailsRequest.newBuilder()
@@ -430,8 +463,11 @@ public final GetStageExecutionDetailsPagedResponse getStageExecutionDetails(
    * <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 (MetricsV1Beta3Client metricsV1Beta3Client = MetricsV1Beta3Client.create()) {
    *   GetStageExecutionDetailsRequest request =
    *       GetStageExecutionDetailsRequest.newBuilder()
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MetricsV1Beta3Settings.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MetricsV1Beta3Settings.java
index b77b2e120a55..7c4ab4a00642 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MetricsV1Beta3Settings.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/MetricsV1Beta3Settings.java
@@ -54,17 +54,17 @@
  * <p>For example, to set the total timeout of getJobMetrics 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
  * MetricsV1Beta3Settings.Builder metricsV1Beta3SettingsBuilder =
  *     MetricsV1Beta3Settings.newBuilder();
  * metricsV1Beta3SettingsBuilder
  *     .getJobMetricsSettings()
  *     .setRetrySettings(
- *         metricsV1Beta3SettingsBuilder
- *             .getJobMetricsSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         metricsV1Beta3SettingsBuilder.getJobMetricsSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * MetricsV1Beta3Settings metricsV1Beta3Settings = metricsV1Beta3SettingsBuilder.build();
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/SnapshotsV1Beta3Client.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/SnapshotsV1Beta3Client.java
index a53a4375aff4..60abf7fa3c1e 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/SnapshotsV1Beta3Client.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/SnapshotsV1Beta3Client.java
@@ -33,8 +33,11 @@
  * 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 (SnapshotsV1Beta3Client snapshotsV1Beta3Client = SnapshotsV1Beta3Client.create()) {
  *   GetSnapshotRequest request =
  *       GetSnapshotRequest.newBuilder()
@@ -76,8 +79,11 @@
  * <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
  * SnapshotsV1Beta3Settings snapshotsV1Beta3Settings =
  *     SnapshotsV1Beta3Settings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -89,8 +95,11 @@
  * <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
  * SnapshotsV1Beta3Settings snapshotsV1Beta3Settings =
  *     SnapshotsV1Beta3Settings.newBuilder().setEndpoint(myEndpoint).build();
  * SnapshotsV1Beta3Client snapshotsV1Beta3Client =
@@ -101,8 +110,11 @@
  * 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
  * SnapshotsV1Beta3Settings snapshotsV1Beta3Settings =
  *     SnapshotsV1Beta3Settings.newBuilder()
  *         .setTransportChannelProvider(
@@ -172,8 +184,11 @@ public SnapshotsV1Beta3Stub 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 (SnapshotsV1Beta3Client snapshotsV1Beta3Client = SnapshotsV1Beta3Client.create()) {
    *   GetSnapshotRequest request =
    *       GetSnapshotRequest.newBuilder()
@@ -199,8 +214,11 @@ public final Snapshot getSnapshot(GetSnapshotRequest 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 (SnapshotsV1Beta3Client snapshotsV1Beta3Client = SnapshotsV1Beta3Client.create()) {
    *   GetSnapshotRequest request =
    *       GetSnapshotRequest.newBuilder()
@@ -225,8 +243,11 @@ public final UnaryCallable<GetSnapshotRequest, Snapshot> getSnapshotCallable() {
    * <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 (SnapshotsV1Beta3Client snapshotsV1Beta3Client = SnapshotsV1Beta3Client.create()) {
    *   DeleteSnapshotRequest request =
    *       DeleteSnapshotRequest.newBuilder()
@@ -252,8 +273,11 @@ public final DeleteSnapshotResponse deleteSnapshot(DeleteSnapshotRequest 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 (SnapshotsV1Beta3Client snapshotsV1Beta3Client = SnapshotsV1Beta3Client.create()) {
    *   DeleteSnapshotRequest request =
    *       DeleteSnapshotRequest.newBuilder()
@@ -280,8 +304,11 @@ public final DeleteSnapshotResponse deleteSnapshot(DeleteSnapshotRequest 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 (SnapshotsV1Beta3Client snapshotsV1Beta3Client = SnapshotsV1Beta3Client.create()) {
    *   ListSnapshotsRequest request =
    *       ListSnapshotsRequest.newBuilder()
@@ -307,8 +334,11 @@ public final ListSnapshotsResponse listSnapshots(ListSnapshotsRequest 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 (SnapshotsV1Beta3Client snapshotsV1Beta3Client = SnapshotsV1Beta3Client.create()) {
    *   ListSnapshotsRequest request =
    *       ListSnapshotsRequest.newBuilder()
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/SnapshotsV1Beta3Settings.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/SnapshotsV1Beta3Settings.java
index c9227927f954..0d701aabeb67 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/SnapshotsV1Beta3Settings.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/SnapshotsV1Beta3Settings.java
@@ -50,17 +50,17 @@
  * <p>For example, to set the total timeout of getSnapshot 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
  * SnapshotsV1Beta3Settings.Builder snapshotsV1Beta3SettingsBuilder =
  *     SnapshotsV1Beta3Settings.newBuilder();
  * snapshotsV1Beta3SettingsBuilder
  *     .getSnapshotSettings()
  *     .setRetrySettings(
- *         snapshotsV1Beta3SettingsBuilder
- *             .getSnapshotSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         snapshotsV1Beta3SettingsBuilder.getSnapshotSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * SnapshotsV1Beta3Settings snapshotsV1Beta3Settings = snapshotsV1Beta3SettingsBuilder.build();
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/TemplatesServiceClient.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/TemplatesServiceClient.java
index f2cc11aeb3a6..28172b532d4c 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/TemplatesServiceClient.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/TemplatesServiceClient.java
@@ -33,8 +33,11 @@
  * 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 (TemplatesServiceClient templatesServiceClient = TemplatesServiceClient.create()) {
  *   CreateJobFromTemplateRequest request =
  *       CreateJobFromTemplateRequest.newBuilder()
@@ -78,8 +81,11 @@
  * <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
  * TemplatesServiceSettings templatesServiceSettings =
  *     TemplatesServiceSettings.newBuilder()
  *         .setCredentialsProvider(FixedCredentialsProvider.create(myCredentials))
@@ -91,8 +97,11 @@
  * <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
  * TemplatesServiceSettings templatesServiceSettings =
  *     TemplatesServiceSettings.newBuilder().setEndpoint(myEndpoint).build();
  * TemplatesServiceClient templatesServiceClient =
@@ -103,8 +112,11 @@
  * 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
  * TemplatesServiceSettings templatesServiceSettings =
  *     TemplatesServiceSettings.newBuilder()
  *         .setTransportChannelProvider(
@@ -174,8 +186,11 @@ public TemplatesServiceStub 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 (TemplatesServiceClient templatesServiceClient = TemplatesServiceClient.create()) {
    *   CreateJobFromTemplateRequest request =
    *       CreateJobFromTemplateRequest.newBuilder()
@@ -203,8 +218,11 @@ public final Job createJobFromTemplate(CreateJobFromTemplateRequest 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 (TemplatesServiceClient templatesServiceClient = TemplatesServiceClient.create()) {
    *   CreateJobFromTemplateRequest request =
    *       CreateJobFromTemplateRequest.newBuilder()
@@ -232,8 +250,11 @@ public final UnaryCallable<CreateJobFromTemplateRequest, Job> createJobFromTempl
    * <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 (TemplatesServiceClient templatesServiceClient = TemplatesServiceClient.create()) {
    *   LaunchTemplateRequest request =
    *       LaunchTemplateRequest.newBuilder()
@@ -260,8 +281,11 @@ public final LaunchTemplateResponse launchTemplate(LaunchTemplateRequest 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 (TemplatesServiceClient templatesServiceClient = TemplatesServiceClient.create()) {
    *   LaunchTemplateRequest request =
    *       LaunchTemplateRequest.newBuilder()
@@ -289,8 +313,11 @@ public final LaunchTemplateResponse launchTemplate(LaunchTemplateRequest 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 (TemplatesServiceClient templatesServiceClient = TemplatesServiceClient.create()) {
    *   GetTemplateRequest request =
    *       GetTemplateRequest.newBuilder()
@@ -315,8 +342,11 @@ public final GetTemplateResponse getTemplate(GetTemplateRequest 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 (TemplatesServiceClient templatesServiceClient = TemplatesServiceClient.create()) {
    *   GetTemplateRequest request =
    *       GetTemplateRequest.newBuilder()
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/TemplatesServiceSettings.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/TemplatesServiceSettings.java
index 709d3a8a7350..4ee289f1fd9c 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/TemplatesServiceSettings.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/TemplatesServiceSettings.java
@@ -50,8 +50,11 @@
  * <p>For example, to set the total timeout of createJobFromTemplate 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
  * TemplatesServiceSettings.Builder templatesServiceSettingsBuilder =
  *     TemplatesServiceSettings.newBuilder();
  * templatesServiceSettingsBuilder
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/package-info.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/package-info.java
index 77d6ff772cdc..ebd16c9f176e 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/package-info.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/package-info.java
@@ -27,8 +27,11 @@
  * <p>Sample for JobsV1Beta3Client:
  *
  * <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 (JobsV1Beta3Client jobsV1Beta3Client = JobsV1Beta3Client.create()) {
  *   CreateJobRequest request =
  *       CreateJobRequest.newBuilder()
@@ -50,8 +53,11 @@
  * <p>Sample for MessagesV1Beta3Client:
  *
  * <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 (MessagesV1Beta3Client messagesV1Beta3Client = MessagesV1Beta3Client.create()) {
  *   ListJobMessagesRequest request =
  *       ListJobMessagesRequest.newBuilder()
@@ -77,8 +83,11 @@
  * <p>Sample for MetricsV1Beta3Client:
  *
  * <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 (MetricsV1Beta3Client metricsV1Beta3Client = MetricsV1Beta3Client.create()) {
  *   GetJobMetricsRequest request =
  *       GetJobMetricsRequest.newBuilder()
@@ -98,8 +107,11 @@
  * <p>Sample for SnapshotsV1Beta3Client:
  *
  * <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 (SnapshotsV1Beta3Client snapshotsV1Beta3Client = SnapshotsV1Beta3Client.create()) {
  *   GetSnapshotRequest request =
  *       GetSnapshotRequest.newBuilder()
@@ -118,8 +130,11 @@
  * <p>Sample for TemplatesServiceClient:
  *
  * <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 (TemplatesServiceClient templatesServiceClient = TemplatesServiceClient.create()) {
  *   CreateJobFromTemplateRequest request =
  *       CreateJobFromTemplateRequest.newBuilder()
@@ -140,8 +155,11 @@
  * <p>Sample for FlexTemplatesServiceClient:
  *
  * <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 (FlexTemplatesServiceClient flexTemplatesServiceClient =
  *     FlexTemplatesServiceClient.create()) {
  *   LaunchFlexTemplateRequest request =
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/FlexTemplatesServiceStubSettings.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/FlexTemplatesServiceStubSettings.java
index 97e06d9114f1..8769ed53e914 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/FlexTemplatesServiceStubSettings.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/FlexTemplatesServiceStubSettings.java
@@ -62,8 +62,11 @@
  * <p>For example, to set the total timeout of launchFlexTemplate 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
  * FlexTemplatesServiceStubSettings.Builder flexTemplatesServiceSettingsBuilder =
  *     FlexTemplatesServiceStubSettings.newBuilder();
  * flexTemplatesServiceSettingsBuilder
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/HttpJsonFlexTemplatesServiceStub.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/HttpJsonFlexTemplatesServiceStub.java
index 9ee342c5ae10..2f2776bd0f81 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/HttpJsonFlexTemplatesServiceStub.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/HttpJsonFlexTemplatesServiceStub.java
@@ -80,7 +80,8 @@ public class HttpJsonFlexTemplatesServiceStub extends FlexTemplatesServiceStub {
                               ProtoRestSerializer.create()
                                   .toBody(
                                       "*",
-                                      request.toBuilder().clearLocation().clearProjectId().build()))
+                                      request.toBuilder().clearLocation().clearProjectId().build(),
+                                      false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<LaunchFlexTemplateResponse>newBuilder()
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/HttpJsonJobsV1Beta3Stub.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/HttpJsonJobsV1Beta3Stub.java
index 639622ee621f..8a7098004649 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/HttpJsonJobsV1Beta3Stub.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/HttpJsonJobsV1Beta3Stub.java
@@ -87,7 +87,8 @@ public class HttpJsonJobsV1Beta3Stub extends JobsV1Beta3Stub {
                         return fields;
                       })
                   .setRequestBodyExtractor(
-                      request -> ProtoRestSerializer.create().toBody("job", request.getJob()))
+                      request ->
+                          ProtoRestSerializer.create().toBody("job", request.getJob(), false))
                   .build())
           .setResponseParser(
               ProtoMessageResponseParser.<Job>newBuilder()
@@ -159,7 +160,8 @@ public class HttpJsonJobsV1Beta3Stub extends JobsV1Beta3Stub {
                         return fields;
                       })
                   .setRequestBodyExtractor(
-                      request -> ProtoRestSerializer.create().toBody("job", request.getJob()))
+                      request ->
+                          ProtoRestSerializer.create().toBody("job", request.getJob(), false))
                   .build())
           .setResponseParser(
               ProtoMessageResponseParser.<Job>newBuilder()
@@ -282,7 +284,8 @@ public class HttpJsonJobsV1Beta3Stub extends JobsV1Beta3Stub {
                                           .clearJobId()
                                           .clearLocation()
                                           .clearProjectId()
-                                          .build()))
+                                          .build(),
+                                      false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<Snapshot>newBuilder()
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/HttpJsonTemplatesServiceStub.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/HttpJsonTemplatesServiceStub.java
index c76e921786fb..8fc02fe1d636 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/HttpJsonTemplatesServiceStub.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/HttpJsonTemplatesServiceStub.java
@@ -85,7 +85,8 @@ public class HttpJsonTemplatesServiceStub extends TemplatesServiceStub {
                               ProtoRestSerializer.create()
                                   .toBody(
                                       "*",
-                                      request.toBuilder().clearLocation().clearProjectId().build()))
+                                      request.toBuilder().clearLocation().clearProjectId().build(),
+                                      false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<Job>newBuilder()
@@ -128,7 +129,7 @@ public class HttpJsonTemplatesServiceStub extends TemplatesServiceStub {
                       .setRequestBodyExtractor(
                           request ->
                               ProtoRestSerializer.create()
-                                  .toBody("launchParameters", request.getLaunchParameters()))
+                                  .toBody("launchParameters", request.getLaunchParameters(), false))
                       .build())
               .setResponseParser(
                   ProtoMessageResponseParser.<LaunchTemplateResponse>newBuilder()
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/JobsV1Beta3StubSettings.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/JobsV1Beta3StubSettings.java
index 298a2e1abcfc..030d80d75ca9 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/JobsV1Beta3StubSettings.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/JobsV1Beta3StubSettings.java
@@ -81,17 +81,17 @@
  * <p>For example, to set the total timeout of createJob 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
  * JobsV1Beta3StubSettings.Builder jobsV1Beta3SettingsBuilder =
  *     JobsV1Beta3StubSettings.newBuilder();
  * jobsV1Beta3SettingsBuilder
  *     .createJobSettings()
  *     .setRetrySettings(
- *         jobsV1Beta3SettingsBuilder
- *             .createJobSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         jobsV1Beta3SettingsBuilder.createJobSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * JobsV1Beta3StubSettings jobsV1Beta3Settings = jobsV1Beta3SettingsBuilder.build();
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/MessagesV1Beta3StubSettings.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/MessagesV1Beta3StubSettings.java
index e9b535d91c5f..9d814749435d 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/MessagesV1Beta3StubSettings.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/MessagesV1Beta3StubSettings.java
@@ -73,17 +73,17 @@
  * <p>For example, to set the total timeout of listJobMessages 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
  * MessagesV1Beta3StubSettings.Builder messagesV1Beta3SettingsBuilder =
  *     MessagesV1Beta3StubSettings.newBuilder();
  * messagesV1Beta3SettingsBuilder
  *     .listJobMessagesSettings()
  *     .setRetrySettings(
- *         messagesV1Beta3SettingsBuilder
- *             .listJobMessagesSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         messagesV1Beta3SettingsBuilder.listJobMessagesSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * MessagesV1Beta3StubSettings messagesV1Beta3Settings = messagesV1Beta3SettingsBuilder.build();
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/MetricsV1Beta3StubSettings.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/MetricsV1Beta3StubSettings.java
index 8692fbb124ee..c827fd34b4de 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/MetricsV1Beta3StubSettings.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/MetricsV1Beta3StubSettings.java
@@ -79,17 +79,17 @@
  * <p>For example, to set the total timeout of getJobMetrics 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
  * MetricsV1Beta3StubSettings.Builder metricsV1Beta3SettingsBuilder =
  *     MetricsV1Beta3StubSettings.newBuilder();
  * metricsV1Beta3SettingsBuilder
  *     .getJobMetricsSettings()
  *     .setRetrySettings(
- *         metricsV1Beta3SettingsBuilder
- *             .getJobMetricsSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         metricsV1Beta3SettingsBuilder.getJobMetricsSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * MetricsV1Beta3StubSettings metricsV1Beta3Settings = metricsV1Beta3SettingsBuilder.build();
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/SnapshotsV1Beta3StubSettings.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/SnapshotsV1Beta3StubSettings.java
index 17bed099a20e..07be4d2d04ad 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/SnapshotsV1Beta3StubSettings.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/SnapshotsV1Beta3StubSettings.java
@@ -67,17 +67,17 @@
  * <p>For example, to set the total timeout of getSnapshot 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
  * SnapshotsV1Beta3StubSettings.Builder snapshotsV1Beta3SettingsBuilder =
  *     SnapshotsV1Beta3StubSettings.newBuilder();
  * snapshotsV1Beta3SettingsBuilder
  *     .getSnapshotSettings()
  *     .setRetrySettings(
- *         snapshotsV1Beta3SettingsBuilder
- *             .getSnapshotSettings()
- *             .getRetrySettings()
- *             .toBuilder()
+ *         snapshotsV1Beta3SettingsBuilder.getSnapshotSettings().getRetrySettings().toBuilder()
  *             .setTotalTimeout(Duration.ofSeconds(30))
  *             .build());
  * SnapshotsV1Beta3StubSettings snapshotsV1Beta3Settings = snapshotsV1Beta3SettingsBuilder.build();
diff --git a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/TemplatesServiceStubSettings.java b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/TemplatesServiceStubSettings.java
index d4fbc4a7da8b..cb8656ce2a44 100644
--- a/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/TemplatesServiceStubSettings.java
+++ b/java-dataflow/google-cloud-dataflow/src/main/java/com/google/dataflow/v1beta3/stub/TemplatesServiceStubSettings.java
@@ -67,8 +67,11 @@
  * <p>For example, to set the total timeout of createJobFromTemplate 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
  * TemplatesServiceStubSettings.Builder templatesServiceSettingsBuilder =
  *     TemplatesServiceStubSettings.newBuilder();
  * templatesServiceSettingsBuilder