Merge pull request kubernetes#82583 from RainbowMango/pr_wrap_buckets_functionality

Add wrapper for prometheus buckets functionality

Author: k8s-ci-robot

staging/src/k8s.io/component-base/metrics/histogram.go

@@ -21,6 +21,19 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 )
 
+// DefBuckets is a wrapper for prometheus.DefBuckets
+var DefBuckets = prometheus.DefBuckets
+
+// LinearBuckets is a wrapper for prometheus.LinearBuckets.
+func LinearBuckets(start, width float64, count int) []float64 {
+	return prometheus.LinearBuckets(start, width, count)
+}
+
+// ExponentialBuckets is a wrapper for prometheus.ExponentialBuckets.
+func ExponentialBuckets(start, factor float64, count int) []float64 {
+	return prometheus.ExponentialBuckets(start, factor, count)
+}
+
 // Histogram is our internal representation for our wrapping struct around prometheus
 // histograms. Summary implements both kubeCollector and ObserverMetric
 type Histogram struct {