diff --git a/google/monitoring/v3/alert.proto b/google/monitoring/v3/alert.proto
index 4c995b13..1e22e61c 100644
--- a/google/monitoring/v3/alert.proto
+++ b/google/monitoring/v3/alert.proto
@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2018 Google LLC.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+//
 
 syntax = "proto3";
 
diff --git a/google/monitoring/v3/alert_service.proto b/google/monitoring/v3/alert_service.proto
index 4bcb9d36..c97e3dc0 100644
--- a/google/monitoring/v3/alert_service.proto
+++ b/google/monitoring/v3/alert_service.proto
@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2018 Google LLC.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+//
 
 syntax = "proto3";
 
diff --git a/google/monitoring/v3/common.proto b/google/monitoring/v3/common.proto
index 3e9653a8..f33af523 100644
--- a/google/monitoring/v3/common.proto
+++ b/google/monitoring/v3/common.proto
@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2018 Google LLC.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+//
 
 syntax = "proto3";
 
@@ -391,8 +392,8 @@ enum ComparisonType {
   COMPARISON_NE = 6;
 }
 
-// The tier of service for a Stackdriver account. Please see the
-// [service tiers documentation](https://cloud.google.com/monitoring/accounts/tiers)
+// The tier of service for a Workspace. Please see the
+// [service tiers documentation](https://cloud.google.com/monitoring/workspaces/tiers)
 // for more details.
 enum ServiceTier {
   option deprecated = true;
@@ -404,12 +405,12 @@ enum ServiceTier {
   // The Stackdriver Basic tier, a free tier of service that provides basic
   // features, a moderate allotment of logs, and access to built-in metrics.
   // A number of features are not available in this tier. For more details,
-  // see [the service tiers documentation](https://cloud.google.com/monitoring/accounts/tiers).
+  // see [the service tiers documentation](https://cloud.google.com/monitoring/workspaces/tiers).
   SERVICE_TIER_BASIC = 1;
 
   // The Stackdriver Premium tier, a higher, more expensive tier of service
   // that provides access to all Stackdriver features, lets you use Stackdriver
   // with AWS accounts, and has a larger allotments for logs and metrics. For
-  // more details, see [the service tiers documentation](https://cloud.google.com/monitoring/accounts/tiers).
+  // more details, see [the service tiers documentation](https://cloud.google.com/monitoring/workspaces/tiers).
   SERVICE_TIER_PREMIUM = 2;
 }
diff --git a/google/monitoring/v3/dropped_labels.proto b/google/monitoring/v3/dropped_labels.proto
index bc3b8545..11287062 100644
--- a/google/monitoring/v3/dropped_labels.proto
+++ b/google/monitoring/v3/dropped_labels.proto
@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2018 Google LLC.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+//
 
 syntax = "proto3";
 
diff --git a/google/monitoring/v3/group.proto b/google/monitoring/v3/group.proto
index bad5016c..f7f49615 100644
--- a/google/monitoring/v3/group.proto
+++ b/google/monitoring/v3/group.proto
@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2018 Google LLC.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+//
 
 syntax = "proto3";
 
diff --git a/google/monitoring/v3/group_service.proto b/google/monitoring/v3/group_service.proto
index 7cfae976..4af7e371 100644
--- a/google/monitoring/v3/group_service.proto
+++ b/google/monitoring/v3/group_service.proto
@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2018 Google LLC.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+//
 
 syntax = "proto3";
 
diff --git a/google/monitoring/v3/metric.proto b/google/monitoring/v3/metric.proto
index 9d2d8d72..57031322 100644
--- a/google/monitoring/v3/metric.proto
+++ b/google/monitoring/v3/metric.proto
@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2018 Google LLC.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+//
 
 syntax = "proto3";
 
diff --git a/google/monitoring/v3/metric_service.proto b/google/monitoring/v3/metric_service.proto
index 170c4eae..faf758e1 100644
--- a/google/monitoring/v3/metric_service.proto
+++ b/google/monitoring/v3/metric_service.proto
@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2018 Google LLC.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+//
 
 syntax = "proto3";
 
@@ -236,7 +237,6 @@ message ListTimeSeriesRequest {
   //
   //     metric.type = "compute.googleapis.com/instance/cpu/usage_time" AND
   //         metric.label.instance_name = "my-instance-name"
-  //
   string filter = 2;
 
   // The time interval for which results should be returned. Only time series
diff --git a/google/monitoring/v3/mutation_record.proto b/google/monitoring/v3/mutation_record.proto
index 3c979a17..5f85864f 100644
--- a/google/monitoring/v3/mutation_record.proto
+++ b/google/monitoring/v3/mutation_record.proto
@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2018 Google LLC.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+//
 
 syntax = "proto3";
 
diff --git a/google/monitoring/v3/notification.proto b/google/monitoring/v3/notification.proto
index ed6a56f7..ac042762 100644
--- a/google/monitoring/v3/notification.proto
+++ b/google/monitoring/v3/notification.proto
@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2018 Google LLC.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+//
 
 syntax = "proto3";
 
diff --git a/google/monitoring/v3/notification_service.proto b/google/monitoring/v3/notification_service.proto
index 745e3984..e2c6a0ea 100644
--- a/google/monitoring/v3/notification_service.proto
+++ b/google/monitoring/v3/notification_service.proto
@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2018 Google LLC.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+//
 
 syntax = "proto3";
 
@@ -20,6 +21,7 @@ import "google/api/annotations.proto";
 import "google/monitoring/v3/notification.proto";
 import "google/protobuf/empty.proto";
 import "google/protobuf/field_mask.proto";
+import "google/protobuf/struct.proto";
 import "google/protobuf/timestamp.proto";
 
 option csharp_namespace = "Google.Cloud.Monitoring.V3";
@@ -68,7 +70,7 @@ service NotificationChannelService {
   }
 
   // Creates a new notification channel, representing a single notification
-  // endpoint such as an email address, SMS number, or pagerduty service.
+  // endpoint such as an email address, SMS number, or PagerDuty service.
   rpc CreateNotificationChannel(CreateNotificationChannelRequest) returns (NotificationChannel) {
     option (google.api.http) = {
       post: "/v3/{name=projects/*}/notificationChannels"
diff --git a/google/monitoring/v3/span_context.proto b/google/monitoring/v3/span_context.proto
index c099bbb6..e870d8f6 100644
--- a/google/monitoring/v3/span_context.proto
+++ b/google/monitoring/v3/span_context.proto
@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2018 Google LLC.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+//
 
 syntax = "proto3";
 
diff --git a/google/monitoring/v3/uptime.proto b/google/monitoring/v3/uptime.proto
index 4c280e9b..4f1b7aaa 100644
--- a/google/monitoring/v3/uptime.proto
+++ b/google/monitoring/v3/uptime.proto
@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2018 Google LLC.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+//
 
 syntax = "proto3";
 
@@ -27,24 +28,34 @@ option java_package = "com.google.monitoring.v3";
 option php_namespace = "Google\\Cloud\\Monitoring\\V3";
 
 
-// Nimbus InternalCheckers.
+// An internal checker allows uptime checks to run on private/internal GCP
+// resources.
 message InternalChecker {
-  // The GCP project ID. Not necessarily the same as the project_id for the
-  // config.
-  string project_id = 1;
+  // A unique resource name for this InternalChecker. The format is:
+  //
+  //
+  //   `projects/[PROJECT_ID]/internalCheckers/[INTERNAL_CHECKER_ID]`.
+  //
+  // PROJECT_ID is the stackdriver workspace project for the
+  // uptime check config associated with the internal checker.
+  string name = 1;
 
-  // The internal network to perform this uptime check on.
-  string network = 2;
+  // The checker's human-readable name. The display name
+  // should be unique within a Stackdriver Workspace in order to make it easier
+  // to identify; however, uniqueness is not enforced.
+  string display_name = 2;
+
+  // The [GCP VPC network](https://cloud.google.com/vpc/docs/vpc) where the
+  // internal resource lives (ex: "default").
+  string network = 3;
 
   // The GCP zone the uptime check should egress from. Only respected for
   // internal uptime checks, where internal_network is specified.
-  string gcp_zone = 3;
+  string gcp_zone = 4;
 
-  // The checker ID.
-  string checker_id = 4;
-
-  // The checker's human-readable name.
-  string display_name = 5;
+  // The GCP project_id where the internal checker lives. Not necessary
+  // the same as the workspace project.
+  string peer_project_id = 6;
 }
 
 // This message configures which resources and services to monitor for
@@ -118,11 +129,10 @@ message UptimeCheckConfig {
     int32 port = 1;
   }
 
-  // Used to perform string matching. Currently, this matches on the exact
-  // content. In the future, it can be expanded to allow for regular expressions
-  // and more complex matching.
+  // Used to perform string matching. It allows substring and regular
+  // expressions, together with their negations.
   message ContentMatcher {
-    // String content to match (max 1024 bytes)
+    // String or regex content to match (max 1024 bytes)
     string content = 1;
   }
 
@@ -137,7 +147,7 @@ message UptimeCheckConfig {
   string name = 1;
 
   // A human-friendly name for the uptime check configuration. The display name
-  // should be unique within a Stackdriver Account in order to make it easier
+  // should be unique within a Stackdriver Workspace in order to make it easier
   // to identify; however, uniqueness is not enforced. Required.
   string display_name = 2;
 
@@ -185,17 +195,21 @@ message UptimeCheckConfig {
   repeated ContentMatcher content_matchers = 9;
 
   // The list of regions from which the check will be run.
+  // Some regions contain one location, and others contain more than one.
   // If this field is specified, enough regions to include a minimum of
   // 3 locations must be provided, or an error message is returned.
   // Not specifying this field will result in uptime checks running from all
   // regions.
   repeated UptimeCheckRegion selected_regions = 10;
 
-  // Denotes whether this is a check that egresses from InternalCheckers.
+  // If this is true, then checks are made only from the 'internal_checkers'.
+  // If it is false, then checks are made only from the 'selected_regions'.
+  // It is an error to provide 'selected_regions' when is_internal is true,
+  // or to provide 'internal_checkers' when is_internal is false.
   bool is_internal = 15;
 
   // The internal checkers that this check will egress from. If `is_internal` is
-  // true and this list is empty, the check will egress from all
+  // true and this list is empty, the check will egress from all the
   // InternalCheckers configured for the project that owns this CheckConfig.
   repeated InternalChecker internal_checkers = 14;
 }
diff --git a/google/monitoring/v3/uptime_service.proto b/google/monitoring/v3/uptime_service.proto
index 3293edae..e7948833 100644
--- a/google/monitoring/v3/uptime_service.proto
+++ b/google/monitoring/v3/uptime_service.proto
@@ -1,4 +1,4 @@
-// Copyright 2018 Google LLC
+// Copyright 2018 Google LLC.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+//
 
 syntax = "proto3";