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diff --git a/third_party/googleapis/google/api/billing.proto b/third_party/googleapis/google/api/billing.proto
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+// Copyright 2015 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// 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";
+
+package google.api;
+
+option go_package = "google.golang.org/genproto/googleapis/api/serviceconfig;serviceconfig";
+option java_multiple_files = true;
+option java_outer_classname = "BillingProto";
+option java_package = "com.google.api";
+option objc_class_prefix = "GAPI";
+
+// Billing related configuration of the service.
+//
+// The following example shows how to configure monitored resources and metrics
+// for billing, `consumer_destinations` is the only supported destination and
+// the monitored resources need at least one label key
+// `cloud.googleapis.com/location` to indicate the location of the billing
+// usage, using different monitored resources between monitoring and billing is
+// recommended so they can be evolved independently:
+//
+//
+//     monitored_resources:
+//     - type: library.googleapis.com/billing_branch
+//       labels:
+//       - key: cloud.googleapis.com/location
+//         description: |
+//           Predefined label to support billing location restriction.
+//       - key: city
+//         description: |
+//           Custom label to define the city where the library branch is located
+//           in.
+//       - key: name
+//         description: Custom label to define the name of the library branch.
+//     metrics:
+//     - name: library.googleapis.com/book/borrowed_count
+//       metric_kind: DELTA
+//       value_type: INT64
+//       unit: "1"
+//     billing:
+//       consumer_destinations:
+//       - monitored_resource: library.googleapis.com/billing_branch
+//         metrics:
+//         - library.googleapis.com/book/borrowed_count
+message Billing {
+  // Configuration of a specific billing destination (Currently only support
+  // bill against consumer project).
+  message BillingDestination {
+    // The monitored resource type. The type must be defined in
+    // [Service.monitored_resources][google.api.Service.monitored_resources] section.
+    string monitored_resource = 1;
+
+    // Names of the metrics to report to this billing destination.
+    // Each name must be defined in [Service.metrics][google.api.Service.metrics] section.
+    repeated string metrics = 2;
+  }
+
+  // Billing configurations for sending metrics to the consumer project.
+  // There can be multiple consumer destinations per service, each one must have
+  // a different monitored resource type. A metric can be used in at most
+  // one consumer destination.
+  repeated BillingDestination consumer_destinations = 8;
+}