Update to kube v1.17

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

vendor/k8s.io/component-base/metrics/counter.go

@@ -0,0 +1,170 @@
+/*
+Copyright 2019 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/blang/semver"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// Counter is our internal representation for our wrapping struct around prometheus
+// counters. Counter implements both kubeCollector and CounterMetric.
+type Counter struct {
+	CounterMetric
+	*CounterOpts
+	lazyMetric
+	selfCollector
+}
+
+// NewCounter returns an object which satisfies the kubeCollector and CounterMetric interfaces.
+// However, the object returned will not measure anything unless the collector is first
+// registered, since the metric is lazily instantiated.
+func NewCounter(opts *CounterOpts) *Counter {
+	opts.StabilityLevel.setDefaults()
+
+	kc := &Counter{
+		CounterOpts: opts,
+		lazyMetric:  lazyMetric{},
+	}
+	kc.setPrometheusCounter(noop)
+	kc.lazyInit(kc)
+	return kc
+}
+
+// setPrometheusCounter sets the underlying CounterMetric object, i.e. the thing that does the measurement.
+func (c *Counter) setPrometheusCounter(counter prometheus.Counter) {
+	c.CounterMetric = counter
+	c.initSelfCollection(counter)
+}
+
+// DeprecatedVersion returns a pointer to the Version or nil
+func (c *Counter) DeprecatedVersion() *semver.Version {
+	return parseSemver(c.CounterOpts.DeprecatedVersion)
+}
+
+// initializeMetric invocation creates the actual underlying Counter. Until this method is called
+// the underlying counter is a no-op.
+func (c *Counter) initializeMetric() {
+	c.CounterOpts.annotateStabilityLevel()
+	// this actually creates the underlying prometheus counter.
+	c.setPrometheusCounter(prometheus.NewCounter(c.CounterOpts.toPromCounterOpts()))
+}
+
+// initializeDeprecatedMetric invocation creates the actual (but deprecated) Counter. Until this method
+// is called the underlying counter is a no-op.
+func (c *Counter) initializeDeprecatedMetric() {
+	c.CounterOpts.markDeprecated()
+	c.initializeMetric()
+}
+
+// CounterVec is the internal representation of our wrapping struct around prometheus
+// counterVecs. CounterVec implements both kubeCollector and CounterVecMetric.
+type CounterVec struct {
+	*prometheus.CounterVec
+	*CounterOpts
+	lazyMetric
+	originalLabels []string
+}
+
+// NewCounterVec returns an object which satisfies the kubeCollector and CounterVecMetric interfaces.
+// However, the object returned will not measure anything unless the collector is first
+// registered, since the metric is lazily instantiated.
+func NewCounterVec(opts *CounterOpts, labels []string) *CounterVec {
+	opts.StabilityLevel.setDefaults()
+
+	cv := &CounterVec{
+		CounterVec:     noopCounterVec,
+		CounterOpts:    opts,
+		originalLabels: labels,
+		lazyMetric:     lazyMetric{},
+	}
+	cv.lazyInit(cv)
+	return cv
+}
+
+// DeprecatedVersion returns a pointer to the Version or nil
+func (v *CounterVec) DeprecatedVersion() *semver.Version {
+	return parseSemver(v.CounterOpts.DeprecatedVersion)
+
+}
+
+// initializeMetric invocation creates the actual underlying CounterVec. Until this method is called
+// the underlying counterVec is a no-op.
+func (v *CounterVec) initializeMetric() {
+	v.CounterOpts.annotateStabilityLevel()
+	v.CounterVec = prometheus.NewCounterVec(v.CounterOpts.toPromCounterOpts(), v.originalLabels)
+}
+
+// initializeDeprecatedMetric invocation creates the actual (but deprecated) CounterVec. Until this method is called
+// the underlying counterVec is a no-op.
+func (v *CounterVec) initializeDeprecatedMetric() {
+	v.CounterOpts.markDeprecated()
+	v.initializeMetric()
+}
+
+// Default Prometheus behavior actually results in the creation of a new metric
+// if a metric with the unique label values is not found in the underlying stored metricMap.
+// This means  that if this function is called but the underlying metric is not registered
+// (which means it will never be exposed externally nor consumed), the metric will exist in memory
+// for perpetuity (i.e. throughout application lifecycle).
+//
+// For reference: https://github.com/prometheus/client_golang/blob/v0.9.2/prometheus/counter.go#L179-L197
+
+// WithLabelValues returns the Counter for the given slice of label
+// values (same order as the VariableLabels in Desc). If that combination of
+// label values is accessed for the first time, a new Counter is created IFF the counterVec
+// has been registered to a metrics registry.
+func (v *CounterVec) WithLabelValues(lvs ...string) CounterMetric {
+	if !v.IsCreated() {
+		return noop // return no-op counter
+	}
+	return v.CounterVec.WithLabelValues(lvs...)
+}
+
+// With returns the Counter for the given Labels map (the label names
+// must match those of the VariableLabels in Desc). If that label map is
+// accessed for the first time, a new Counter is created IFF the counterVec has
+// been registered to a metrics registry.
+func (v *CounterVec) With(labels map[string]string) CounterMetric {
+	if !v.IsCreated() {
+		return noop // return no-op counter
+	}
+	return v.CounterVec.With(labels)
+}
+
+// Delete deletes the metric where the variable labels are the same as those
+// passed in as labels. It returns true if a metric was deleted.
+//
+// It is not an error if the number and names of the Labels are inconsistent
+// with those of the VariableLabels in Desc. However, such inconsistent Labels
+// can never match an actual metric, so the method will always return false in
+// that case.
+func (v *CounterVec) Delete(labels map[string]string) bool {
+	if !v.IsCreated() {
+		return false // since we haven't created the metric, we haven't deleted a metric with the passed in values
+	}
+	return v.CounterVec.Delete(labels)
+}
+
+// Reset deletes all metrics in this vector.
+func (v *CounterVec) Reset() {
+	if !v.IsCreated() {
+		return
+	}
+
+	v.CounterVec.Reset()
+}