diff --git a/pkg/audit/metrics.go b/pkg/audit/metrics.go
index 6c51d1385..88d4154e8 100644
--- a/pkg/audit/metrics.go
+++ b/pkg/audit/metrics.go
@@ -29,6 +29,14 @@ const (
 	subsystem = "apiserver_audit"
 )
 
+/*
+ * By default, all the following metrics are defined as falling under
+ * ALPHA stability level https://github.com/kubernetes/enhancements/blob/master/keps/sig-instrumentation/20190404-kubernetes-control-plane-metrics-stability.md#stability-classes)
+ *
+ * Promoting the stability level of the metric is a responsibility of the component owner, since it
+ * involves explicitly acknowledging support for the metric across multiple releases, in accordance with
+ * the metric stability policy.
+ */
 var (
 	eventCounter = metrics.NewCounter(
 		&metrics.CounterOpts{
diff --git a/pkg/authentication/request/x509/x509.go b/pkg/authentication/request/x509/x509.go
index 364ac2d94..d45c86340 100644
--- a/pkg/authentication/request/x509/x509.go
+++ b/pkg/authentication/request/x509/x509.go
@@ -31,6 +31,14 @@ import (
 	"k8s.io/component-base/metrics/legacyregistry"
 )
 
+/*
+ * By default, the following metric is defined as falling under
+ * ALPHA stability level https://github.com/kubernetes/enhancements/blob/master/keps/sig-instrumentation/20190404-kubernetes-control-plane-metrics-stability.md#stability-classes)
+ *
+ * Promoting the stability level of the metric is a responsibility of the component owner, since it
+ * involves explicitly acknowledging support for the metric across multiple releases, in accordance with
+ * the metric stability policy.
+ */
 var clientCertificateExpirationHistogram = metrics.NewHistogram(
 	&metrics.HistogramOpts{
 		Namespace: "apiserver",
diff --git a/pkg/endpoints/filters/authentication.go b/pkg/endpoints/filters/authentication.go
index 17b456a03..1b4de1899 100644
--- a/pkg/endpoints/filters/authentication.go
+++ b/pkg/endpoints/filters/authentication.go
@@ -32,6 +32,14 @@ import (
 	"k8s.io/klog"
 )
 
+/*
+ * By default, all the following metrics are defined as falling under
+ * ALPHA stability level https://github.com/kubernetes/enhancements/blob/master/keps/sig-instrumentation/20190404-kubernetes-control-plane-metrics-stability.md#stability-classes)
+ *
+ * Promoting the stability level of the metric is a responsibility of the component owner, since it
+ * involves explicitly acknowledging support for the metric across multiple releases, in accordance with
+ * the metric stability policy.
+ */
 var (
 	authenticatedUserCounter = metrics.NewCounterVec(
 		&metrics.CounterOpts{
diff --git a/pkg/endpoints/metrics/metrics.go b/pkg/endpoints/metrics/metrics.go
index 429496456..30ce24a4b 100644
--- a/pkg/endpoints/metrics/metrics.go
+++ b/pkg/endpoints/metrics/metrics.go
@@ -52,6 +52,14 @@ const (
 	APIServerComponent string = "apiserver"
 )
 
+/*
+ * By default, all the following metrics are defined as falling under
+ * ALPHA stability level https://github.com/kubernetes/enhancements/blob/master/keps/sig-instrumentation/20190404-kubernetes-control-plane-metrics-stability.md#stability-classes)
+ *
+ * Promoting the stability level of the metric is a responsibility of the component owner, since it
+ * involves explicitly acknowledging support for the metric across multiple releases, in accordance with
+ * the metric stability policy.
+ */
 var (
 	// TODO(a-robinson): Add unit tests for the handling of these metrics once
 	// the upstream library supports it.
diff --git a/pkg/storage/cacher/cacher.go b/pkg/storage/cacher/cacher.go
index f27db4e9d..822615fb6 100644
--- a/pkg/storage/cacher/cacher.go
+++ b/pkg/storage/cacher/cacher.go
@@ -45,6 +45,14 @@ import (
 	utiltrace "k8s.io/utils/trace"
 )
 
+/*
+ * By default, all the following metrics are defined as falling under
+ * ALPHA stability level https://github.com/kubernetes/enhancements/blob/master/keps/sig-instrumentation/20190404-kubernetes-control-plane-metrics-stability.md#stability-classes)
+ *
+ * Promoting the stability level of the metric is a responsibility of the component owner, since it
+ * involves explicitly acknowledging support for the metric across multiple releases, in accordance with
+ * the metric stability policy.
+ */
 var (
 	initCounter = metrics.NewCounterVec(
 		&metrics.CounterOpts{
diff --git a/pkg/storage/etcd3/metrics/metrics.go b/pkg/storage/etcd3/metrics/metrics.go
index c32326c04..32210db16 100644
--- a/pkg/storage/etcd3/metrics/metrics.go
+++ b/pkg/storage/etcd3/metrics/metrics.go
@@ -24,6 +24,14 @@ import (
 	"k8s.io/component-base/metrics/legacyregistry"
 )
 
+/*
+ * By default, all the following metrics are defined as falling under
+ * ALPHA stability level https://github.com/kubernetes/enhancements/blob/master/keps/sig-instrumentation/20190404-kubernetes-control-plane-metrics-stability.md#stability-classes)
+ *
+ * Promoting the stability level of the metric is a responsibility of the component owner, since it
+ * involves explicitly acknowledging support for the metric across multiple releases, in accordance with
+ * the metric stability policy.
+ */
 var (
 	etcdRequestLatency = compbasemetrics.NewHistogramVec(
 		&compbasemetrics.HistogramOpts{
diff --git a/pkg/storage/value/metrics.go b/pkg/storage/value/metrics.go
index 179d2b98e..f35994688 100644
--- a/pkg/storage/value/metrics.go
+++ b/pkg/storage/value/metrics.go
@@ -32,6 +32,14 @@ const (
 	subsystem = "storage"
 )
 
+/*
+ * By default, all the following metrics are defined as falling under
+ * ALPHA stability level https://github.com/kubernetes/enhancements/blob/master/keps/sig-instrumentation/20190404-kubernetes-control-plane-metrics-stability.md#stability-classes)
+ *
+ * Promoting the stability level of the metric is a responsibility of the component owner, since it
+ * involves explicitly acknowledging support for the metric across multiple releases, in accordance with
+ * the metric stability policy.
+ */
 var (
 	transformerLatencies = metrics.NewHistogramVec(
 		&metrics.HistogramOpts{