File: metrics.proto

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// Copyright 2013 Prometheus Team
// 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 = "proto2";

package io.prometheus.client;
option java_package = "io.prometheus.client";

message LabelPair {
  optional string name  = 1;
  optional string value = 2;
}

enum MetricType {
  COUNTER    = 0;
  GAUGE      = 1;
  SUMMARY    = 2;
  UNTYPED    = 3;
  HISTOGRAM  = 4;
}

message Gauge {
  optional double value = 1;
}

message Counter {
  optional double value = 1;
}

message Quantile {
  optional double quantile = 1;
  optional double value    = 2;
}

message Summary {
  optional uint64   sample_count = 1;
  optional double   sample_sum   = 2;
  repeated Quantile quantile     = 3;
}

message Untyped {
  optional double value = 1;
}

message Histogram {
  optional uint64 sample_count = 1;
  optional double sample_sum   = 2;
  repeated Bucket bucket       = 3; // Ordered in increasing order of upper_bound, +Inf bucket is optional.
}

message Bucket {
  optional uint64 cumulative_count = 1; // Cumulative in increasing order.
  optional double upper_bound = 2;      // Inclusive.
}

message Metric {
  repeated LabelPair label        = 1;
  optional Gauge     gauge        = 2;
  optional Counter   counter      = 3;
  optional Summary   summary      = 4;
  optional Untyped   untyped      = 5;
  optional Histogram histogram    = 7;
  optional int64     timestamp_ms = 6;
}

message MetricFamily {
  optional string     name   = 1;
  optional string     help   = 2;
  optional MetricType type   = 3;
  repeated Metric     metric = 4;
}