add support for ExponentialBucketsRange

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

@@ -33,6 +33,16 @@ func ExponentialBuckets(start, factor float64, count int) []float64 {
 	return prometheus.ExponentialBuckets(start, factor, count)
 }
 
+// ExponentialBucketsRange creates 'count' buckets, where the lowest bucket is
+// 'min' and the highest bucket is 'max'. The final +Inf bucket is not counted
+// and not included in the returned slice. The returned slice is meant to be
+// used for the Buckets field of HistogramOpts.
+//
+// The function panics if 'count' is 0 or negative, if 'min' is 0 or negative.
+func ExponentialBucketsRange(min, max float64, count int) []float64 {
+	return prometheus.ExponentialBucketsRange(min, max, count)
+}
+
 // MergeBuckets merges buckets together
 func MergeBuckets(buckets ...[]float64) []float64 {
 	result := make([]float64, 1)

test/instrumentation/decode_metric.go

@@ -484,7 +484,9 @@ func (c *metricDecoder) decodeBucketFunctionCall(v *ast.CallExpr) ([]float64, er
 					case "LinearBuckets":
 						merged = append(merged, metrics.LinearBuckets(firstArg, secondArg, thirdArg)...)
 					case "ExponentialBuckets":
-						merged = append(merged, metrics.LinearBuckets(firstArg, secondArg, thirdArg)...)
+						merged = append(merged, metrics.ExponentialBuckets(firstArg, secondArg, thirdArg)...)
+					case "ExponentialBucketsRange":
+						merged = append(merged, metrics.ExponentialBucketsRange(firstArg, secondArg, thirdArg)...)
 					}
 				}
 			}
@@ -513,6 +515,12 @@ func (c *metricDecoder) decodeBucketFunctionCall(v *ast.CallExpr) ([]float64, er
 			return nil, err, true
 		}
 		return metrics.ExponentialBuckets(firstArg, secondArg, thirdArg), nil, true
+	case "ExponentialBucketsRange":
+		firstArg, secondArg, thirdArg, err := decodeBucketArguments(v)
+		if err != nil {
+			return nil, err, true
+		}
+		return metrics.ExponentialBucketsRange(firstArg, secondArg, thirdArg), nil, true
 	case "MergeBuckets":
 		merged := []float64{}
 		for _, arg := range v.Args {

test/instrumentation/testdata/pkg/kubelet/metrics/metrics.go

@@ -193,8 +193,8 @@ var (
 			Subsystem:      KubeletSubsystem,
 			Name:           CgroupManagerOperationsKey,
 			Help:           "Duration in seconds for cgroup manager operations. Broken down by method.",
-			Buckets:        metrics.DefBuckets,
-			StabilityLevel: metrics.ALPHA,
+			Buckets:        metrics.ExponentialBucketsRange(0.01, 10, 10),
+			StabilityLevel: metrics.BETA,
 		},
 		[]string{"operation_type"},
 	)

test/instrumentation/testdata/test-stable-metrics-list.yaml

@@ -122,6 +122,24 @@
     certificate is invalid or unused, the value will be +INF.
   type: Gauge
   stabilityLevel: BETA
+- name: cgroup_manager_duration_seconds
+  subsystem: kubelet
+  help: Duration in seconds for cgroup manager operations. Broken down by method.
+  type: Histogram
+  stabilityLevel: BETA
+  labels:
+  - operation_type
+  buckets:
+  - 0.01
+  - 0.02154434690031884
+  - 0.046415888336127795
+  - 0.10000000000000002
+  - 0.21544346900318842
+  - 0.46415888336127803
+  - 1.0000000000000002
+  - 2.1544346900318847
+  - 4.641588833612781
+  - 10.000000000000005
 - name: device_plugin_alloc_duration_seconds
   subsystem: kubelet
   help: Duration in seconds to serve a device plugin Allocation request. Broken down