use istio client-go library instead of knative (#1661)

use istio client-go library instead of knative
bump kubernetes dependency version
change code coverage to codecov

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

@@ -0,0 +1,124 @@
+/*
+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"
+	"k8s.io/client-go/util/workqueue"
+	logf "sigs.k8s.io/controller-runtime/pkg/internal/log"
+)
+
+var log = logf.RuntimeLog.WithName("metrics")
+
+// This file is copied and adapted from k8s.io/kubernetes/pkg/util/workqueue/prometheus
+// which registers metrics to the default prometheus Registry. We require very
+// similar functionality, but must register metrics to a different Registry.
+
+func init() {
+	workqueue.SetProvider(workqueueMetricsProvider{})
+}
+
+func registerWorkqueueMetric(c prometheus.Collector, name, queue string) {
+	if err := Registry.Register(c); err != nil {
+		log.Error(err, "failed to register metric", "name", name, "queue", queue)
+	}
+}
+
+type workqueueMetricsProvider struct{}
+
+func (workqueueMetricsProvider) NewDepthMetric(queue string) workqueue.GaugeMetric {
+	const name = "workqueue_depth"
+	m := prometheus.NewGauge(prometheus.GaugeOpts{
+		Name:        name,
+		Help:        "Current depth of workqueue",
+		ConstLabels: prometheus.Labels{"name": queue},
+	})
+	registerWorkqueueMetric(m, name, queue)
+	return m
+}
+
+func (workqueueMetricsProvider) NewAddsMetric(queue string) workqueue.CounterMetric {
+	const name = "workqueue_adds_total"
+	m := prometheus.NewCounter(prometheus.CounterOpts{
+		Name:        name,
+		Help:        "Total number of adds handled by workqueue",
+		ConstLabels: prometheus.Labels{"name": queue},
+	})
+	registerWorkqueueMetric(m, name, queue)
+	return m
+}
+
+func (workqueueMetricsProvider) NewLatencyMetric(queue string) workqueue.HistogramMetric {
+	const name = "workqueue_queue_duration_seconds"
+	m := prometheus.NewHistogram(prometheus.HistogramOpts{
+		Name:        name,
+		Help:        "How long in seconds an item stays in workqueue before being requested.",
+		ConstLabels: prometheus.Labels{"name": queue},
+		Buckets:     prometheus.ExponentialBuckets(10e-9, 10, 10),
+	})
+	registerWorkqueueMetric(m, name, queue)
+	return m
+}
+
+func (workqueueMetricsProvider) NewWorkDurationMetric(queue string) workqueue.HistogramMetric {
+	const name = "workqueue_work_duration_seconds"
+	m := prometheus.NewHistogram(prometheus.HistogramOpts{
+		Name:        name,
+		Help:        "How long in seconds processing an item from workqueue takes.",
+		ConstLabels: prometheus.Labels{"name": queue},
+		Buckets:     prometheus.ExponentialBuckets(10e-9, 10, 10),
+	})
+	registerWorkqueueMetric(m, name, queue)
+	return m
+}
+
+func (workqueueMetricsProvider) NewUnfinishedWorkSecondsMetric(queue string) workqueue.SettableGaugeMetric {
+	const name = "workqueue_unfinished_work_seconds"
+	m := prometheus.NewGauge(prometheus.GaugeOpts{
+		Name: name,
+		Help: "How many seconds of work has done that " +
+			"is in progress and hasn't been observed by work_duration. Large " +
+			"values indicate stuck threads. One can deduce the number of stuck " +
+			"threads by observing the rate at which this increases.",
+		ConstLabels: prometheus.Labels{"name": queue},
+	})
+	registerWorkqueueMetric(m, name, queue)
+	return m
+}
+
+func (workqueueMetricsProvider) NewLongestRunningProcessorSecondsMetric(queue string) workqueue.SettableGaugeMetric {
+	const name = "workqueue_longest_running_processor_seconds"
+	m := prometheus.NewGauge(prometheus.GaugeOpts{
+		Name: name,
+		Help: "How many seconds has the longest running " +
+			"processor for workqueue been running.",
+		ConstLabels: prometheus.Labels{"name": queue},
+	})
+	registerWorkqueueMetric(m, name, queue)
+	return m
+}
+
+func (workqueueMetricsProvider) NewRetriesMetric(queue string) workqueue.CounterMetric {
+	const name = "workqueue_retries_total"
+	m := prometheus.NewCounter(prometheus.CounterOpts{
+		Name:        name,
+		Help:        "Total number of retries handled by workqueue",
+		ConstLabels: prometheus.Labels{"name": queue},
+	})
+	registerWorkqueueMetric(m, name, queue)
+	return m
+}