--- /dev/null
+// 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.
+// 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 cc_enable_arenas = true;
+option go_package = "google.golang.org/genproto/googleapis/api/label;label";
+option java_multiple_files = true;
+option java_outer_classname = "LabelProto";
+option java_package = "com.google.api";
+option objc_class_prefix = "GAPI";
+
+// A description of a label.
+message LabelDescriptor {
+ // Value types that can be used as label values.
+ enum ValueType {
+ // A variable-length string. This is the default.
+ STRING = 0;
+
+ // Boolean; true or false.
+ BOOL = 1;
+
+ // A 64-bit signed integer.
+ INT64 = 2;
+ }
+
+ // The label key.
+ string key = 1;
+
+ // The type of data that can be assigned to the label.
+ ValueType value_type = 2;
+
+ // A human-readable description for the label.
+ string description = 3;
+}