Initial v1.0.0 commit

vendor/sigs.k8s.io/controller-runtime/pkg/webhook/internal/metrics/metrics.go

@@ -0,0 +1,61 @@
+/*
+Copyright 2018 The Kubernetes 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.
+*/
+
+package metrics
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+
+	"sigs.k8s.io/controller-runtime/pkg/metrics"
+)
+
+var (
+	// RequestLatency is a prometheus metric which is a histogram of the latency
+	// of processing admission requests.
+	RequestLatency = prometheus.NewHistogramVec(
+		prometheus.HistogramOpts{
+			Name: "controller_runtime_webhook_latency_seconds",
+			Help: "Histogram of the latency of processing admission requests",
+		},
+		[]string{"webhook"},
+	)
+
+	// RequestTotal is a prometheus metric which is a counter of the total processed admission requests.
+	RequestTotal = func() *prometheus.CounterVec {
+		return prometheus.NewCounterVec(
+			prometheus.CounterOpts{
+				Name: "controller_runtime_webhook_requests_total",
+				Help: "Total number of admission requests by HTTP status code.",
+			},
+			[]string{"webhook", "code"},
+		)
+	}()
+
+	// RequestInFlight is a prometheus metric which is a gauge of the in-flight admission requests.
+	RequestInFlight = func() *prometheus.GaugeVec {
+		return prometheus.NewGaugeVec(
+			prometheus.GaugeOpts{
+				Name: "controller_runtime_webhook_requests_in_flight",
+				Help: "Current number of admission requests being served.",
+			},
+			[]string{"webhook"},
+		)
+	}()
+)
+
+func init() {
+	metrics.Registry.MustRegister(RequestLatency, RequestTotal, RequestInFlight)
+}