Update KEP for Kubelet Resource Metrics endpoint GA release

keps/sig-node/727-resource-metrics-endpoint/README.md

@@ -3,26 +3,28 @@
 ## Table of Contents
 
 <!-- toc -->
-- [Summary](#summary)
-- [Background](#background)
-- [Motivation](#motivation)
-  - [Goals](#goals)
-  - [Non-Goals](#non-goals)
-- [Proposal](#proposal)
-  - [API](#api)
-- [Future Improvements](#future-improvements)
-- [Benchmarking](#benchmarking)
-  - [Round 1](#round-1)
-    - [Methods](#methods)
-    - [Results](#results)
-  - [Round 2](#round-2)
-    - [Methods](#methods-1)
-    - [Results](#results-1)
-- [Alternatives Considered](#alternatives-considered)
-  - [gRPC API](#grpc-api)
-  - [Test Plan](#test-plan)
-- [Graduation Criteria](#graduation-criteria)
-- [Implementation History](#implementation-history)
+- [Kubelet Resource Metrics Endpoint](#kubelet-resource-metrics-endpoint)
+  - [Table of Contents](#table-of-contents)
+  - [Summary](#summary)
+  - [Background](#background)
+  - [Motivation](#motivation)
+    - [Goals](#goals)
+    - [Non-Goals](#non-goals)
+  - [Proposal](#proposal)
+    - [API](#api)
+  - [Future Improvements](#future-improvements)
+  - [Benchmarking](#benchmarking)
+    - [Round 1](#round-1)
+      - [Methods](#methods)
+      - [Results](#results)
+    - [Round 2](#round-2)
+      - [Methods](#methods-1)
+      - [Results](#results-1)
+  - [Alternatives Considered](#alternatives-considered)
+    - [gRPC API](#grpc-api)
+    - [Test Plan](#test-plan)
+  - [Graduation Criteria](#graduation-criteria)
+  - [Implementation History](#implementation-history)
 <!-- /toc -->
 
 ## Summary
@@ -202,11 +204,11 @@ Alpha:
 
 Beta:
 
-- [ ] Modify the metrics server to consume the kubelet resource metrics endpoint 3 releases after it is added to the kubelet
+- [X] Modify the metrics server to consume the kubelet resource metrics endpoint 3 releases after it is added to the kubelet
 
 GA:
 
-- [ ] Add node-e2e test to the node conformance tests
+- [X] Add node-e2e test to the node conformance tests
 
 ## Implementation History
 
@@ -216,3 +218,4 @@ GA:
 - 2019-02-07: Presentation to Sig-Instrumentation
 - 2020-01-14: [1.18] Endpoint copied from /metrics/resource/v1alpha1 to /metrics/resource, and adopting the metrics stability framework: https://github.com/kubernetes/kubernetes/pull/86282
 - 2020-09-01: [1.20] /metrics/resource/v1alpha1 removed: https://github.com/kubernetes/kubernetes/pull/94272
+- 2021-06-28: Use kubelet's /metrics/resource endpoint in metrics-server: https://github.com/kubernetes-sigs/metrics-server/pull/777