Expose /resetMetrics handle in apiserver

pkg/apiserver/metrics/metrics.go

@@ -0,0 +1,74 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+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.
+*/
+
+package metrics
+
+import (
+	"io"
+	"net/http"
+	"strconv"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+var (
+	// TODO(a-robinson): Add unit tests for the handling of these metrics once
+	// the upstream library supports it.
+	requestCounter = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "apiserver_request_count",
+			Help: "Counter of apiserver requests broken out for each verb, API resource, client, and HTTP response code.",
+		},
+		[]string{"verb", "resource", "client", "code"},
+	)
+	requestLatencies = prometheus.NewHistogramVec(
+		prometheus.HistogramOpts{
+			Name: "apiserver_request_latencies",
+			Help: "Response latency distribution in microseconds for each verb, resource and client.",
+			// Use buckets ranging from 125 ms to 8 seconds.
+			Buckets: prometheus.ExponentialBuckets(125000, 2.0, 7),
+		},
+		[]string{"verb", "resource"},
+	)
+	requestLatenciesSummary = prometheus.NewSummaryVec(
+		prometheus.SummaryOpts{
+			Name: "apiserver_request_latencies_summary",
+			Help: "Response latency summary in microseconds for each verb and resource.",
+		},
+		[]string{"verb", "resource"},
+	)
+)
+
+// Register all metrics.
+func Register() {
+	prometheus.MustRegister(requestCounter)
+	prometheus.MustRegister(requestLatencies)
+	prometheus.MustRegister(requestLatenciesSummary)
+}
+
+func Monitor(verb, resource *string, client string, httpCode *int, reqStart time.Time) {
+	requestCounter.WithLabelValues(*verb, *resource, client, strconv.Itoa(*httpCode)).Inc()
+	requestLatencies.WithLabelValues(*verb, *resource).Observe(float64((time.Since(reqStart)) / time.Microsecond))
+	requestLatenciesSummary.WithLabelValues(*verb, *resource).Observe(float64((time.Since(reqStart)) / time.Microsecond))
+}
+
+func Reset(w http.ResponseWriter, req *http.Request) {
+	requestCounter.Reset()
+	requestLatencies.Reset()
+	requestLatenciesSummary.Reset()
+	io.WriteString(w, "metrics reset\n")
+}