pkg/metrics/workqueue.go: remove deprecated metrics

Deprecated metrics from upstream k8s.io/client-go/util/workqueue
were removed prior to 1.15, so they can now be safely removed
from controller-runtime.

See: kubernetes/client-go@ee078c7

Author: joelanford

pkg/metrics/workqueue.go

@@ -122,52 +122,3 @@ func (workqueueMetricsProvider) NewRetriesMetric(queue string) workqueue.Counter
 	registerWorkqueueMetric(m, name, queue)
 	return m
 }
-
-// TODO(abursavich): Remove the following deprecated metrics when they are
-// removed from k8s.io/client-go/util/workqueue.
-
-func (workqueueMetricsProvider) NewDeprecatedLongestRunningProcessorMicrosecondsMetric(queue string) workqueue.SettableGaugeMetric {
-	const name = "workqueue_longest_running_processor_microseconds"
-	m := prometheus.NewGauge(prometheus.GaugeOpts{
-		Name: name,
-		Help: "(Deprecated) How many microseconds has the longest running " +
-			"processor for workqueue been running.",
-		ConstLabels: prometheus.Labels{"name": queue},
-	})
-	registerWorkqueueMetric(m, name, queue)
-	return m
-}
-
-// NOTE: The following deprecated metrics are noops because they were never
-// included in controller-runtime.
-
-func (workqueueMetricsProvider) NewDeprecatedDepthMetric(queue string) workqueue.GaugeMetric {
-	return noopMetric{}
-}
-
-func (workqueueMetricsProvider) NewDeprecatedAddsMetric(queue string) workqueue.CounterMetric {
-	return noopMetric{}
-}
-
-func (workqueueMetricsProvider) NewDeprecatedLatencyMetric(queue string) workqueue.SummaryMetric {
-	return noopMetric{}
-}
-
-func (workqueueMetricsProvider) NewDeprecatedWorkDurationMetric(queue string) workqueue.SummaryMetric {
-	return noopMetric{}
-}
-
-func (workqueueMetricsProvider) NewDeprecatedUnfinishedWorkSecondsMetric(queue string) workqueue.SettableGaugeMetric {
-	return noopMetric{}
-}
-
-func (workqueueMetricsProvider) NewDeprecatedRetriesMetric(queue string) workqueue.CounterMetric {
-	return noopMetric{}
-}
-
-type noopMetric struct{}
-
-func (noopMetric) Inc()            {}
-func (noopMetric) Dec()            {}
-func (noopMetric) Set(float64)     {}
-func (noopMetric) Observe(float64) {}