diff --git a/packages/google-container/samples/generated/v1/cluster_manager.cancel_operation.js b/packages/google-container/samples/generated/v1/cluster_manager.cancel_operation.js
index f1a35c6b2d2..f4d133f07cf 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.cancel_operation.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.cancel_operation.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_CancelOperation_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.complete_i_p_rotation.js b/packages/google-container/samples/generated/v1/cluster_manager.complete_i_p_rotation.js
index 6af3f963a75..a5dd0501419 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.complete_i_p_rotation.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.complete_i_p_rotation.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_CompleteIPRotation_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.complete_node_pool_upgrade.js b/packages/google-container/samples/generated/v1/cluster_manager.complete_node_pool_upgrade.js
index c5a8e6048ed..d819a53952f 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.complete_node_pool_upgrade.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.complete_node_pool_upgrade.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_CompleteNodePoolUpgrade_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.create_cluster.js b/packages/google-container/samples/generated/v1/cluster_manager.create_cluster.js
index 204dcbbd744..4497e142a43 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.create_cluster.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.create_cluster.js
@@ -23,6 +23,9 @@
 function main(cluster) {
   // [START container_v1_generated_ClusterManager_CreateCluster_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.create_node_pool.js b/packages/google-container/samples/generated/v1/cluster_manager.create_node_pool.js
index af60d05f377..caced3fee96 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.create_node_pool.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.create_node_pool.js
@@ -23,6 +23,9 @@
 function main(nodePool) {
   // [START container_v1_generated_ClusterManager_CreateNodePool_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.delete_cluster.js b/packages/google-container/samples/generated/v1/cluster_manager.delete_cluster.js
index ba757276861..241e48a1afe 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.delete_cluster.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.delete_cluster.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_DeleteCluster_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.delete_node_pool.js b/packages/google-container/samples/generated/v1/cluster_manager.delete_node_pool.js
index ba697521c98..392cf2681d2 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.delete_node_pool.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.delete_node_pool.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_DeleteNodePool_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.get_cluster.js b/packages/google-container/samples/generated/v1/cluster_manager.get_cluster.js
index 89428f5e416..4d1bd19739f 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.get_cluster.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.get_cluster.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_GetCluster_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.get_j_s_o_n_web_keys.js b/packages/google-container/samples/generated/v1/cluster_manager.get_j_s_o_n_web_keys.js
index 0190e749d73..04144db2eba 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.get_j_s_o_n_web_keys.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.get_j_s_o_n_web_keys.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_GetJSONWebKeys_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.get_node_pool.js b/packages/google-container/samples/generated/v1/cluster_manager.get_node_pool.js
index bcb0e231b20..8fbddbdc618 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.get_node_pool.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.get_node_pool.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_GetNodePool_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.get_operation.js b/packages/google-container/samples/generated/v1/cluster_manager.get_operation.js
index 5ef09a4a0c4..9c4b425aa37 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.get_operation.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.get_operation.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_GetOperation_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.get_server_config.js b/packages/google-container/samples/generated/v1/cluster_manager.get_server_config.js
index c21edceea12..1bf591ffe18 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.get_server_config.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.get_server_config.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_GetServerConfig_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.list_clusters.js b/packages/google-container/samples/generated/v1/cluster_manager.list_clusters.js
index d974e281bf5..aa6a4b116ee 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.list_clusters.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.list_clusters.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_ListClusters_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.list_node_pools.js b/packages/google-container/samples/generated/v1/cluster_manager.list_node_pools.js
index 14c853e65a8..3a234ce6769 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.list_node_pools.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.list_node_pools.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_ListNodePools_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.list_operations.js b/packages/google-container/samples/generated/v1/cluster_manager.list_operations.js
index 45191b1e293..911234d50a4 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.list_operations.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.list_operations.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_ListOperations_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.list_usable_subnetworks.js b/packages/google-container/samples/generated/v1/cluster_manager.list_usable_subnetworks.js
index 4ea47b2a8a7..d3d61966c05 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.list_usable_subnetworks.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.list_usable_subnetworks.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_ListUsableSubnetworks_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.rollback_node_pool_upgrade.js b/packages/google-container/samples/generated/v1/cluster_manager.rollback_node_pool_upgrade.js
index c866801e9e5..b237399dc2e 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.rollback_node_pool_upgrade.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.rollback_node_pool_upgrade.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_RollbackNodePoolUpgrade_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.set_addons_config.js b/packages/google-container/samples/generated/v1/cluster_manager.set_addons_config.js
index dc570df0852..9ec41f77a84 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.set_addons_config.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.set_addons_config.js
@@ -23,6 +23,9 @@
 function main(addonsConfig) {
   // [START container_v1_generated_ClusterManager_SetAddonsConfig_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.set_labels.js b/packages/google-container/samples/generated/v1/cluster_manager.set_labels.js
index b8a07a421ae..a8fc2deb528 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.set_labels.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.set_labels.js
@@ -23,6 +23,9 @@
 function main(resourceLabels, labelFingerprint) {
   // [START container_v1_generated_ClusterManager_SetLabels_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.set_legacy_abac.js b/packages/google-container/samples/generated/v1/cluster_manager.set_legacy_abac.js
index 87bd53d3598..cebcea697fc 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.set_legacy_abac.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.set_legacy_abac.js
@@ -23,6 +23,9 @@
 function main(enabled) {
   // [START container_v1_generated_ClusterManager_SetLegacyAbac_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.set_locations.js b/packages/google-container/samples/generated/v1/cluster_manager.set_locations.js
index d926bb734e5..6ecdfdd1b84 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.set_locations.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.set_locations.js
@@ -23,6 +23,9 @@
 function main(locations) {
   // [START container_v1_generated_ClusterManager_SetLocations_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.set_logging_service.js b/packages/google-container/samples/generated/v1/cluster_manager.set_logging_service.js
index 2b120172b4a..79f232f8320 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.set_logging_service.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.set_logging_service.js
@@ -23,6 +23,9 @@
 function main(loggingService) {
   // [START container_v1_generated_ClusterManager_SetLoggingService_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.set_maintenance_policy.js b/packages/google-container/samples/generated/v1/cluster_manager.set_maintenance_policy.js
index bfdf6b47c1e..d4a92ebcc63 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.set_maintenance_policy.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.set_maintenance_policy.js
@@ -23,6 +23,9 @@
 function main(projectId, zone, clusterId, maintenancePolicy) {
   // [START container_v1_generated_ClusterManager_SetMaintenancePolicy_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.set_master_auth.js b/packages/google-container/samples/generated/v1/cluster_manager.set_master_auth.js
index 1fcac1fd012..be77fbda824 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.set_master_auth.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.set_master_auth.js
@@ -23,6 +23,9 @@
 function main(action, update) {
   // [START container_v1_generated_ClusterManager_SetMasterAuth_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.set_monitoring_service.js b/packages/google-container/samples/generated/v1/cluster_manager.set_monitoring_service.js
index 783537d7788..ac0ed27e68a 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.set_monitoring_service.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.set_monitoring_service.js
@@ -23,6 +23,9 @@
 function main(monitoringService) {
   // [START container_v1_generated_ClusterManager_SetMonitoringService_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.set_network_policy.js b/packages/google-container/samples/generated/v1/cluster_manager.set_network_policy.js
index 94e1e76cbd4..946e98c275e 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.set_network_policy.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.set_network_policy.js
@@ -23,6 +23,9 @@
 function main(networkPolicy) {
   // [START container_v1_generated_ClusterManager_SetNetworkPolicy_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.set_node_pool_autoscaling.js b/packages/google-container/samples/generated/v1/cluster_manager.set_node_pool_autoscaling.js
index d5dbb41ac0d..a9b190926f5 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.set_node_pool_autoscaling.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.set_node_pool_autoscaling.js
@@ -23,6 +23,9 @@
 function main(autoscaling) {
   // [START container_v1_generated_ClusterManager_SetNodePoolAutoscaling_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.set_node_pool_management.js b/packages/google-container/samples/generated/v1/cluster_manager.set_node_pool_management.js
index b16dd65f1fd..ef03f3d6f49 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.set_node_pool_management.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.set_node_pool_management.js
@@ -23,6 +23,9 @@
 function main(management) {
   // [START container_v1_generated_ClusterManager_SetNodePoolManagement_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.set_node_pool_size.js b/packages/google-container/samples/generated/v1/cluster_manager.set_node_pool_size.js
index c89962d79ac..8eea9f1e167 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.set_node_pool_size.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.set_node_pool_size.js
@@ -23,6 +23,9 @@
 function main(nodeCount) {
   // [START container_v1_generated_ClusterManager_SetNodePoolSize_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.start_i_p_rotation.js b/packages/google-container/samples/generated/v1/cluster_manager.start_i_p_rotation.js
index 0a28f39f077..308c9fddb26 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.start_i_p_rotation.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.start_i_p_rotation.js
@@ -23,6 +23,9 @@
 function main() {
   // [START container_v1_generated_ClusterManager_StartIPRotation_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.update_cluster.js b/packages/google-container/samples/generated/v1/cluster_manager.update_cluster.js
index a34c25bb90f..2e4a445dc0d 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.update_cluster.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.update_cluster.js
@@ -23,6 +23,9 @@
 function main(update) {
   // [START container_v1_generated_ClusterManager_UpdateCluster_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.update_master.js b/packages/google-container/samples/generated/v1/cluster_manager.update_master.js
index b69ffcac22b..e3c26fb1e76 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.update_master.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.update_master.js
@@ -23,6 +23,9 @@
 function main(masterVersion) {
   // [START container_v1_generated_ClusterManager_UpdateMaster_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/cluster_manager.update_node_pool.js b/packages/google-container/samples/generated/v1/cluster_manager.update_node_pool.js
index d86300583f9..3ae32ee4494 100644
--- a/packages/google-container/samples/generated/v1/cluster_manager.update_node_pool.js
+++ b/packages/google-container/samples/generated/v1/cluster_manager.update_node_pool.js
@@ -23,6 +23,9 @@
 function main(nodeVersion, imageType) {
   // [START container_v1_generated_ClusterManager_UpdateNodePool_async]
   /**
+   * 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.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-container/samples/generated/v1/snippet_metadata.google.container.v1.json b/packages/google-container/samples/generated/v1/snippet_metadata.google.container.v1.json
index 3a6607d3f09..daf3234692f 100644
--- a/packages/google-container/samples/generated/v1/snippet_metadata.google.container.v1.json
+++ b/packages/google-container/samples/generated/v1/snippet_metadata.google.container.v1.json
@@ -22,7 +22,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 51,
+                    "end": 54,
                     "type": "FULL"
                 }
             ],
@@ -70,7 +70,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 50,
+                    "end": 53,
                     "type": "FULL"
                 }
             ],
@@ -122,7 +122,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 56,
+                    "end": 59,
                     "type": "FULL"
                 }
             ],
@@ -174,7 +174,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 55,
+                    "end": 58,
                     "type": "FULL"
                 }
             ],
@@ -230,7 +230,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 128,
+                    "end": 131,
                     "type": "FULL"
                 }
             ],
@@ -342,7 +342,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 56,
+                    "end": 59,
                     "type": "FULL"
                 }
             ],
@@ -402,7 +402,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 63,
+                    "end": 66,
                     "type": "FULL"
                 }
             ],
@@ -458,7 +458,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 63,
+                    "end": 66,
                     "type": "FULL"
                 }
             ],
@@ -514,7 +514,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 56,
+                    "end": 59,
                     "type": "FULL"
                 }
             ],
@@ -570,7 +570,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 60,
+                    "end": 63,
                     "type": "FULL"
                 }
             ],
@@ -626,7 +626,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 62,
+                    "end": 65,
                     "type": "FULL"
                 }
             ],
@@ -682,7 +682,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 60,
+                    "end": 63,
                     "type": "FULL"
                 }
             ],
@@ -742,7 +742,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 50,
+                    "end": 53,
                     "type": "FULL"
                 }
             ],
@@ -794,7 +794,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 51,
+                    "end": 54,
                     "type": "FULL"
                 }
             ],
@@ -842,7 +842,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 50,
+                    "end": 53,
                     "type": "FULL"
                 }
             ],
@@ -894,7 +894,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 50,
+                    "end": 53,
                     "type": "FULL"
                 }
             ],
@@ -946,7 +946,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 50,
+                    "end": 53,
                     "type": "FULL"
                 }
             ],
@@ -994,7 +994,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 50,
+                    "end": 53,
                     "type": "FULL"
                 }
             ],
@@ -1034,7 +1034,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 50,
+                    "end": 53,
                     "type": "FULL"
                 }
             ],
@@ -1086,7 +1086,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 51,
+                    "end": 54,
                     "type": "FULL"
                 }
             ],
@@ -1142,7 +1142,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 56,
+                    "end": 59,
                     "type": "FULL"
                 }
             ],
@@ -1198,7 +1198,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 51,
+                    "end": 54,
                     "type": "FULL"
                 }
             ],
@@ -1254,7 +1254,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 51,
+                    "end": 54,
                     "type": "FULL"
                 }
             ],
@@ -1294,7 +1294,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 56,
+                    "end": 59,
                     "type": "FULL"
                 }
             ],
@@ -1354,7 +1354,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 56,
+                    "end": 59,
                     "type": "FULL"
                 }
             ],
@@ -1414,7 +1414,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 65,
+                    "end": 68,
                     "type": "FULL"
                 }
             ],
@@ -1474,7 +1474,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 55,
+                    "end": 58,
                     "type": "FULL"
                 }
             ],
@@ -1530,7 +1530,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 54,
+                    "end": 57,
                     "type": "FULL"
                 }
             ],
@@ -1586,7 +1586,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 50,
+                    "end": 53,
                     "type": "FULL"
                 }
             ],
@@ -1638,7 +1638,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 56,
+                    "end": 59,
                     "type": "FULL"
                 }
             ],
@@ -1698,7 +1698,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 55,
+                    "end": 58,
                     "type": "FULL"
                 }
             ],
@@ -1754,7 +1754,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 75,
+                    "end": 78,
                     "type": "FULL"
                 }
             ],
@@ -1810,7 +1810,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 71,
+                    "end": 74,
                     "type": "FULL"
                 }
             ],
diff --git a/packages/google-container/src/v1/cluster_manager_client.ts b/packages/google-container/src/v1/cluster_manager_client.ts
index 034df697141..51a957b8d2e 100644
--- a/packages/google-container/src/v1/cluster_manager_client.ts
+++ b/packages/google-container/src/v1/cluster_manager_client.ts
@@ -17,8 +17,8 @@
 // ** All changes to this file may be overwritten. **
 
 /* global window */
-import * as gax from 'google-gax';
-import {
+import type * as gax from 'google-gax';
+import type {
   Callback,
   CallOptions,
   Descriptors,
@@ -26,9 +26,7 @@ import {
   PaginationCallback,
   GaxCall,
 } from 'google-gax';
-
 import {Transform} from 'stream';
-import {RequestType} from 'google-gax/build/src/apitypes';
 import * as protos from '../../protos/protos';
 import jsonProtos = require('../../protos/protos.json');
 /**
@@ -37,7 +35,6 @@ import jsonProtos = require('../../protos/protos.json');
  * This file defines retry strategy and timeouts for all API methods in this library.
  */
 import * as gapicConfig from './cluster_manager_client_config.json';
-
 const version = require('../../../package.json').version;
 
 /**
@@ -96,8 +93,18 @@ export class ClusterManagerClient {
    *     Pass "rest" to use HTTP/1.1 REST API instead of gRPC.
    *     For more information, please check the
    *     {@link https://github.com/googleapis/gax-nodejs/blob/main/client-libraries.md#http11-rest-api-mode documentation}.
+   * @param {gax} [gaxInstance]: loaded instance of `google-gax`. Useful if you
+   *     need to avoid loading the default gRPC version and want to use the fallback
+   *     HTTP implementation. Load only fallback version and pass it to the constructor:
+   *     ```
+   *     const gax = require('google-gax/build/src/fallback'); // avoids loading google-gax with gRPC
+   *     const client = new ClusterManagerClient({fallback: 'rest'}, gax);
+   *     ```
    */
-  constructor(opts?: ClientOptions) {
+  constructor(
+    opts?: ClientOptions,
+    gaxInstance?: typeof gax | typeof gax.fallback
+  ) {
     // Ensure that options include all the required fields.
     const staticMembers = this.constructor as typeof ClusterManagerClient;
     const servicePath =
@@ -117,8 +124,13 @@ export class ClusterManagerClient {
       opts['scopes'] = staticMembers.scopes;
     }
 
+    // Load google-gax module synchronously if needed
+    if (!gaxInstance) {
+      gaxInstance = require('google-gax') as typeof gax;
+    }
+
     // Choose either gRPC or proto-over-HTTP implementation of google-gax.
-    this._gaxModule = opts.fallback ? gax.fallback : gax;
+    this._gaxModule = opts.fallback ? gaxInstance.fallback : gaxInstance;
 
     // Create a `gaxGrpc` object, with any grpc-specific options sent to the client.
     this._gaxGrpc = new this._gaxModule.GrpcClient(opts);
@@ -183,7 +195,7 @@ export class ClusterManagerClient {
     this.innerApiCalls = {};
 
     // Add a warn function to the client constructor so it can be easily tested.
-    this.warn = gax.warn;
+    this.warn = this._gaxModule.warn;
   }
 
   /**
@@ -272,7 +284,8 @@ export class ClusterManagerClient {
       const apiCall = this._gaxModule.createApiCall(
         callPromise,
         this._defaults[methodName],
-        descriptor
+        descriptor,
+        this._opts.fallback
       );
 
       this.innerApiCalls[methodName] = apiCall;
@@ -423,7 +436,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         parent: request.parent || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -521,7 +534,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -633,7 +646,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         parent: request.parent || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -733,7 +746,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -885,7 +898,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -999,7 +1012,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -1117,7 +1130,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -1236,7 +1249,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -1338,7 +1351,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -1449,7 +1462,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -1564,7 +1577,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -1669,7 +1682,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -1776,7 +1789,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -1873,7 +1886,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         parent: request.parent || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -1971,7 +1984,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -2070,7 +2083,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -2166,7 +2179,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -2255,7 +2268,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         parent: request.parent || '',
       });
     this.initialize();
@@ -2351,7 +2364,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         parent: request.parent || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -2454,7 +2467,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -2557,7 +2570,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         parent: request.parent || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -2660,7 +2673,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -2758,7 +2771,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
       });
     this.initialize();
@@ -2874,7 +2887,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -2992,7 +3005,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -3101,7 +3114,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -3202,7 +3215,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -3303,7 +3316,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -3404,7 +3417,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -3511,7 +3524,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -3615,7 +3628,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -3723,7 +3736,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         name: request.name || '',
         project_id: request.projectId || '',
         zone: request.zone || '',
@@ -3835,7 +3848,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         parent: request.parent || '',
       });
     this.initialize();
@@ -3883,14 +3896,14 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         parent: request.parent || '',
       });
     const defaultCallSettings = this._defaults['listUsableSubnetworks'];
     const callSettings = defaultCallSettings.merge(options);
     this.initialize();
     return this.descriptors.page.listUsableSubnetworks.createStream(
-      this.innerApiCalls.listUsableSubnetworks as gax.GaxCall,
+      this.innerApiCalls.listUsableSubnetworks as GaxCall,
       request,
       callSettings
     );
@@ -3940,7 +3953,7 @@ export class ClusterManagerClient {
     options.otherArgs = options.otherArgs || {};
     options.otherArgs.headers = options.otherArgs.headers || {};
     options.otherArgs.headers['x-goog-request-params'] =
-      gax.routingHeader.fromParams({
+      this._gaxModule.routingHeader.fromParams({
         parent: request.parent || '',
       });
     const defaultCallSettings = this._defaults['listUsableSubnetworks'];
@@ -3948,7 +3961,7 @@ export class ClusterManagerClient {
     this.initialize();
     return this.descriptors.page.listUsableSubnetworks.asyncIterate(
       this.innerApiCalls['listUsableSubnetworks'] as GaxCall,
-      request as unknown as RequestType,
+      request as {},
       callSettings
     ) as AsyncIterable<protos.google.container.v1.IUsableSubnetwork>;
   }
diff --git a/packages/google-container/test/gapic_cluster_manager_v1.ts b/packages/google-container/test/gapic_cluster_manager_v1.ts
index 225d6564021..8768b6f9c93 100644
--- a/packages/google-container/test/gapic_cluster_manager_v1.ts
+++ b/packages/google-container/test/gapic_cluster_manager_v1.ts
@@ -113,101 +113,103 @@ function stubAsyncIterationCall<ResponseType>(
 }
 
 describe('v1.ClusterManagerClient', () => {
-  it('has servicePath', () => {
-    const servicePath =
-      clustermanagerModule.v1.ClusterManagerClient.servicePath;
-    assert(servicePath);
-  });
-
-  it('has apiEndpoint', () => {
-    const apiEndpoint =
-      clustermanagerModule.v1.ClusterManagerClient.apiEndpoint;
-    assert(apiEndpoint);
-  });
-
-  it('has port', () => {
-    const port = clustermanagerModule.v1.ClusterManagerClient.port;
-    assert(port);
-    assert(typeof port === 'number');
-  });
+  describe('Common methods', () => {
+    it('has servicePath', () => {
+      const servicePath =
+        clustermanagerModule.v1.ClusterManagerClient.servicePath;
+      assert(servicePath);
+    });
 
-  it('should create a client with no option', () => {
-    const client = new clustermanagerModule.v1.ClusterManagerClient();
-    assert(client);
-  });
+    it('has apiEndpoint', () => {
+      const apiEndpoint =
+        clustermanagerModule.v1.ClusterManagerClient.apiEndpoint;
+      assert(apiEndpoint);
+    });
 
-  it('should create a client with gRPC fallback', () => {
-    const client = new clustermanagerModule.v1.ClusterManagerClient({
-      fallback: true,
+    it('has port', () => {
+      const port = clustermanagerModule.v1.ClusterManagerClient.port;
+      assert(port);
+      assert(typeof port === 'number');
     });
-    assert(client);
-  });
 
-  it('has initialize method and supports deferred initialization', async () => {
-    const client = new clustermanagerModule.v1.ClusterManagerClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('should create a client with no option', () => {
+      const client = new clustermanagerModule.v1.ClusterManagerClient();
+      assert(client);
     });
-    assert.strictEqual(client.clusterManagerStub, undefined);
-    await client.initialize();
-    assert(client.clusterManagerStub);
-  });
 
-  it('has close method for the initialized client', done => {
-    const client = new clustermanagerModule.v1.ClusterManagerClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('should create a client with gRPC fallback', () => {
+      const client = new clustermanagerModule.v1.ClusterManagerClient({
+        fallback: true,
+      });
+      assert(client);
     });
-    client.initialize();
-    assert(client.clusterManagerStub);
-    client.close().then(() => {
-      done();
+
+    it('has initialize method and supports deferred initialization', async () => {
+      const client = new clustermanagerModule.v1.ClusterManagerClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      assert.strictEqual(client.clusterManagerStub, undefined);
+      await client.initialize();
+      assert(client.clusterManagerStub);
     });
-  });
 
-  it('has close method for the non-initialized client', done => {
-    const client = new clustermanagerModule.v1.ClusterManagerClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('has close method for the initialized client', done => {
+      const client = new clustermanagerModule.v1.ClusterManagerClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      client.initialize();
+      assert(client.clusterManagerStub);
+      client.close().then(() => {
+        done();
+      });
     });
-    assert.strictEqual(client.clusterManagerStub, undefined);
-    client.close().then(() => {
-      done();
+
+    it('has close method for the non-initialized client', done => {
+      const client = new clustermanagerModule.v1.ClusterManagerClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      assert.strictEqual(client.clusterManagerStub, undefined);
+      client.close().then(() => {
+        done();
+      });
     });
-  });
 
-  it('has getProjectId method', async () => {
-    const fakeProjectId = 'fake-project-id';
-    const client = new clustermanagerModule.v1.ClusterManagerClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('has getProjectId method', async () => {
+      const fakeProjectId = 'fake-project-id';
+      const client = new clustermanagerModule.v1.ClusterManagerClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      client.auth.getProjectId = sinon.stub().resolves(fakeProjectId);
+      const result = await client.getProjectId();
+      assert.strictEqual(result, fakeProjectId);
+      assert((client.auth.getProjectId as SinonStub).calledWithExactly());
     });
-    client.auth.getProjectId = sinon.stub().resolves(fakeProjectId);
-    const result = await client.getProjectId();
-    assert.strictEqual(result, fakeProjectId);
-    assert((client.auth.getProjectId as SinonStub).calledWithExactly());
-  });
 
-  it('has getProjectId method with callback', async () => {
-    const fakeProjectId = 'fake-project-id';
-    const client = new clustermanagerModule.v1.ClusterManagerClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
-    });
-    client.auth.getProjectId = sinon
-      .stub()
-      .callsArgWith(0, null, fakeProjectId);
-    const promise = new Promise((resolve, reject) => {
-      client.getProjectId((err?: Error | null, projectId?: string | null) => {
-        if (err) {
-          reject(err);
-        } else {
-          resolve(projectId);
-        }
+    it('has getProjectId method with callback', async () => {
+      const fakeProjectId = 'fake-project-id';
+      const client = new clustermanagerModule.v1.ClusterManagerClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      client.auth.getProjectId = sinon
+        .stub()
+        .callsArgWith(0, null, fakeProjectId);
+      const promise = new Promise((resolve, reject) => {
+        client.getProjectId((err?: Error | null, projectId?: string | null) => {
+          if (err) {
+            reject(err);
+          } else {
+            resolve(projectId);
+          }
+        });
       });
+      const result = await promise;
+      assert.strictEqual(result, fakeProjectId);
     });
-    const result = await promise;
-    assert.strictEqual(result, fakeProjectId);
   });
 
   describe('listClusters', () => {