diff --git a/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/AlertPolicyServiceClient.java b/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/AlertPolicyServiceClient.java
index 8a1c87361b17..6a48c01fcb60 100644
--- a/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/AlertPolicyServiceClient.java
+++ b/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/AlertPolicyServiceClient.java
@@ -27,6 +27,7 @@
 import com.google.api.gax.rpc.UnaryCallable;
 import com.google.cloud.monitoring.v3.stub.AlertPolicyServiceStub;
 import com.google.cloud.monitoring.v3.stub.AlertPolicyServiceStubSettings;
+import com.google.common.util.concurrent.MoreExecutors;
 import com.google.monitoring.v3.AlertPolicy;
 import com.google.monitoring.v3.AlertPolicyName;
 import com.google.monitoring.v3.CreateAlertPolicyRequest;
@@ -758,7 +759,8 @@ public static ApiFuture<ListAlertPoliciesPagedResponse> createAsync(
             public ListAlertPoliciesPagedResponse apply(ListAlertPoliciesPage input) {
               return new ListAlertPoliciesPagedResponse(input);
             }
-          });
+          },
+          MoreExecutors.directExecutor());
     }
 
     private ListAlertPoliciesPagedResponse(ListAlertPoliciesPage page) {
diff --git a/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/GroupServiceClient.java b/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/GroupServiceClient.java
index 3badeb060a5a..f8d3578d0d06 100644
--- a/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/GroupServiceClient.java
+++ b/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/GroupServiceClient.java
@@ -28,6 +28,7 @@
 import com.google.api.gax.rpc.UnaryCallable;
 import com.google.cloud.monitoring.v3.stub.GroupServiceStub;
 import com.google.cloud.monitoring.v3.stub.GroupServiceStubSettings;
+import com.google.common.util.concurrent.MoreExecutors;
 import com.google.monitoring.v3.CreateGroupRequest;
 import com.google.monitoring.v3.DeleteGroupRequest;
 import com.google.monitoring.v3.GetGroupRequest;
@@ -790,7 +791,8 @@ public static ApiFuture<ListGroupsPagedResponse> createAsync(
             public ListGroupsPagedResponse apply(ListGroupsPage input) {
               return new ListGroupsPagedResponse(input);
             }
-          });
+          },
+          MoreExecutors.directExecutor());
     }
 
     private ListGroupsPagedResponse(ListGroupsPage page) {
@@ -869,7 +871,8 @@ public static ApiFuture<ListGroupMembersPagedResponse> createAsync(
             public ListGroupMembersPagedResponse apply(ListGroupMembersPage input) {
               return new ListGroupMembersPagedResponse(input);
             }
-          });
+          },
+          MoreExecutors.directExecutor());
     }
 
     private ListGroupMembersPagedResponse(ListGroupMembersPage page) {
diff --git a/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/MetricServiceClient.java b/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/MetricServiceClient.java
index a929908add2f..913183e33640 100644
--- a/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/MetricServiceClient.java
+++ b/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/MetricServiceClient.java
@@ -29,6 +29,7 @@
 import com.google.api.gax.rpc.UnaryCallable;
 import com.google.cloud.monitoring.v3.stub.MetricServiceStub;
 import com.google.cloud.monitoring.v3.stub.MetricServiceStubSettings;
+import com.google.common.util.concurrent.MoreExecutors;
 import com.google.monitoring.v3.CreateMetricDescriptorRequest;
 import com.google.monitoring.v3.CreateTimeSeriesRequest;
 import com.google.monitoring.v3.DeleteMetricDescriptorRequest;
@@ -1239,7 +1240,8 @@ public ListMonitoredResourceDescriptorsPagedResponse apply(
                 ListMonitoredResourceDescriptorsPage input) {
               return new ListMonitoredResourceDescriptorsPagedResponse(input);
             }
-          });
+          },
+          MoreExecutors.directExecutor());
     }
 
     private ListMonitoredResourceDescriptorsPagedResponse(
@@ -1337,7 +1339,8 @@ public static ApiFuture<ListMetricDescriptorsPagedResponse> createAsync(
             public ListMetricDescriptorsPagedResponse apply(ListMetricDescriptorsPage input) {
               return new ListMetricDescriptorsPagedResponse(input);
             }
-          });
+          },
+          MoreExecutors.directExecutor());
     }
 
     private ListMetricDescriptorsPagedResponse(ListMetricDescriptorsPage page) {
@@ -1424,7 +1427,8 @@ public static ApiFuture<ListTimeSeriesPagedResponse> createAsync(
             public ListTimeSeriesPagedResponse apply(ListTimeSeriesPage input) {
               return new ListTimeSeriesPagedResponse(input);
             }
-          });
+          },
+          MoreExecutors.directExecutor());
     }
 
     private ListTimeSeriesPagedResponse(ListTimeSeriesPage page) {
diff --git a/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/NotificationChannelServiceClient.java b/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/NotificationChannelServiceClient.java
index 82b00915caa8..ec971fb6543c 100644
--- a/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/NotificationChannelServiceClient.java
+++ b/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/NotificationChannelServiceClient.java
@@ -27,6 +27,7 @@
 import com.google.api.gax.rpc.UnaryCallable;
 import com.google.cloud.monitoring.v3.stub.NotificationChannelServiceStub;
 import com.google.cloud.monitoring.v3.stub.NotificationChannelServiceStubSettings;
+import com.google.common.util.concurrent.MoreExecutors;
 import com.google.monitoring.v3.CreateNotificationChannelRequest;
 import com.google.monitoring.v3.DeleteNotificationChannelRequest;
 import com.google.monitoring.v3.GetNotificationChannelDescriptorRequest;
@@ -1043,7 +1044,8 @@ public ListNotificationChannelDescriptorsPagedResponse apply(
                 ListNotificationChannelDescriptorsPage input) {
               return new ListNotificationChannelDescriptorsPagedResponse(input);
             }
-          });
+          },
+          MoreExecutors.directExecutor());
     }
 
     private ListNotificationChannelDescriptorsPagedResponse(
@@ -1144,7 +1146,8 @@ public static ApiFuture<ListNotificationChannelsPagedResponse> createAsync(
             public ListNotificationChannelsPagedResponse apply(ListNotificationChannelsPage input) {
               return new ListNotificationChannelsPagedResponse(input);
             }
-          });
+          },
+          MoreExecutors.directExecutor());
     }
 
     private ListNotificationChannelsPagedResponse(ListNotificationChannelsPage page) {
diff --git a/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/UptimeCheckServiceClient.java b/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/UptimeCheckServiceClient.java
index c812cdbc41c5..cfe1554df34f 100644
--- a/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/UptimeCheckServiceClient.java
+++ b/google-cloud-clients/google-cloud-monitoring/src/main/java/com/google/cloud/monitoring/v3/UptimeCheckServiceClient.java
@@ -27,6 +27,7 @@
 import com.google.api.gax.rpc.UnaryCallable;
 import com.google.cloud.monitoring.v3.stub.UptimeCheckServiceStub;
 import com.google.cloud.monitoring.v3.stub.UptimeCheckServiceStubSettings;
+import com.google.common.util.concurrent.MoreExecutors;
 import com.google.monitoring.v3.CreateUptimeCheckConfigRequest;
 import com.google.monitoring.v3.DeleteUptimeCheckConfigRequest;
 import com.google.monitoring.v3.GetUptimeCheckConfigRequest;
@@ -714,7 +715,8 @@ public static ApiFuture<ListUptimeCheckConfigsPagedResponse> createAsync(
             public ListUptimeCheckConfigsPagedResponse apply(ListUptimeCheckConfigsPage input) {
               return new ListUptimeCheckConfigsPagedResponse(input);
             }
-          });
+          },
+          MoreExecutors.directExecutor());
     }
 
     private ListUptimeCheckConfigsPagedResponse(ListUptimeCheckConfigsPage page) {
@@ -804,7 +806,8 @@ public static ApiFuture<ListUptimeCheckIpsPagedResponse> createAsync(
             public ListUptimeCheckIpsPagedResponse apply(ListUptimeCheckIpsPage input) {
               return new ListUptimeCheckIpsPagedResponse(input);
             }
-          });
+          },
+          MoreExecutors.directExecutor());
     }
 
     private ListUptimeCheckIpsPagedResponse(ListUptimeCheckIpsPage page) {
diff --git a/google-cloud-clients/google-cloud-monitoring/synth.metadata b/google-cloud-clients/google-cloud-monitoring/synth.metadata
index 3a6db89a9272..03c6c0e07a28 100644
--- a/google-cloud-clients/google-cloud-monitoring/synth.metadata
+++ b/google-cloud-clients/google-cloud-monitoring/synth.metadata
@@ -1,19 +1,19 @@
 {
-  "updateTime": "2019-02-26T08:47:14.055530Z",
+  "updateTime": "2019-03-06T08:47:52.711546Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "0.16.14",
-        "dockerImage": "googleapis/artman@sha256:f3d61ae45abaeefb6be5f228cda22732c2f1b00fb687c79c4bd4f2c42bb1e1a7"
+        "version": "0.16.15",
+        "dockerImage": "googleapis/artman@sha256:9caadfa59d48224cba5f3217eb9d61a155b78ccf31e628abef385bc5b7ed3bd2"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "29f098cb03a9983cc9cb15993de5da64419046f2",
-        "internalRef": "235621085"
+        "sha": "856117505ff9075b3e9c0b5674113667b6cf9e00",
+        "internalRef": "236931378"
       }
     }
   ],