// Copyright 2018, OpenCensus Authors
//
// 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 opencensus.proto.agent.metrics.v1;

import "opencensus/proto/agent/common/v1/common.proto";
import "opencensus/proto/metrics/v1/metrics.proto";
import "opencensus/proto/resource/v1/resource.proto";

option java_multiple_files = true;
option java_package = "io.opencensus.proto.agent.metrics.v1";
option java_outer_classname = "MetricsServiceProto";

option go_package = "github.com/census-instrumentation/opencensus-proto/gen-go/agent/metrics/v1";

option ruby_package = "OpenCensus::Proto::Agent::Metrics::V1";

// Service that can be used to push metrics between one Application
// instrumented with OpenCensus and an agent, or between an agent and a
// central collector.
service MetricsService {
  // For performance reasons, it is recommended to keep this RPC
  // alive for the entire life of the application.
  rpc Export(stream ExportMetricsServiceRequest) returns (stream ExportMetricsServiceResponse) {}
}

message ExportMetricsServiceRequest {
  // This is required only in the first message on the stream or if the
  // previous sent ExportMetricsServiceRequest message has a different Node (e.g.
  // when the same RPC is used to send Metrics from multiple Applications).
  opencensus.proto.agent.common.v1.Node node = 1;

  // A list of metrics that belong to the last received Node.
  repeated opencensus.proto.metrics.v1.Metric metrics = 2;

  // The resource for the metrics in this message that do not have an explicit
  // resource set.
  // If unset, the most recently set resource in the RPC stream applies. It is
  // valid to never be set within a stream, e.g. when no resource info is known
  // at all or when all sent metrics have an explicit resource set.
  opencensus.proto.resource.v1.Resource resource = 3;
}

message ExportMetricsServiceResponse {
}
