//  Licensed to the Apache Software Foundation (ASF) under one
//  or more contributor license agreements.  See the NOTICE file
//  distributed with this work for additional information
//  regarding copyright ownership.  The ASF licenses this file
//  to you 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 = "proto2";
package heron.proto.system;

option java_package = "org.apache.heron.proto.system";
option java_outer_classname = "Metrics";

import "common.proto";
import "tmaster.proto";

// This file defines the various protocol buffers needed
// for sending metrics from all the system components(workers,
// (stmgrs, tmasters). The components first register themselves
// with MetricPublisherRegisterRequest. And then everytime
// they want to send a metric, they use the 
// MetricPublisherPublishMessage to send out the actual message

message MetricDatum {
  required string name = 1;
  required string value = 2;
}

message ExceptionData {
  // Stack trace of exception. First two lines of stack trace is used for aggregating exception.
  required string stacktrace = 1;
  // Last time the exception occurred in the metrics collection interval
  required string lasttime = 2;
  // First time the exception occurred in the metrics collection interval
  required string firsttime = 3;
  // Number of time exception occurred in the metrics collection interval
  required int32 count = 4;
  // Additional text logged.
  required string logging = 5;
}

message MetricPublisher {
  required string hostname = 1;
  required int32 port = 2;
  // like Tail-FlatMap or __stmgr__
  required string component_name = 3;
  // In case of regular instances, it is their instance_id
  // For stmgr, it is the stmgr id
  required string instance_id = 4;
  // The index of the instance with respect
  // to that component_name
  required int32 instance_index = 5;
}

message MetricPublisherRegisterRequest {
  required MetricPublisher publisher = 1;
}

message MetricPublisherRegisterResponse {
  required Status status = 1;
}

message MetricPublisherPublishMessage {
  repeated MetricDatum metrics = 1;
  repeated ExceptionData exceptions = 2;
}


// This is the tmaster location refresh message sent 
// by the stmgrs to the metricsmgrs
message TMasterLocationRefreshMessage {
  required heron.proto.tmaster.TMasterLocation tmaster = 1;
}

message MetricsCacheLocationRefreshMessage {
  required heron.proto.tmaster.MetricsCacheLocation metricscache = 1;
}