Merge master into breakout_swarm

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

gateway/vendor/github.com/prometheus/client_model/metrics.proto

@@ -0,0 +1,81 @@
+// 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;
+}