Merge pull request kubernetes#2563 from pacoxu/default/container

update default container status

Author: k8s-ci-robot

keps/sig-cli/2227-kubectl-default-container/README.md

@@ -310,7 +310,11 @@ resource usage (CPU, RAM, disk, IO, ...) in any components?**
 
 ## Implementation History
 
-WIP in https://github.com/kubernetes/kubernetes/pull/97099 in 1.21.
+2021-03-10: Alpha implementation completion in 1.21
+- https://github.com/kubernetes/kubernetes/pull/97099
+- https://github.com/kubernetes/kubernetes/pull/99615
+- https://github.com/kubernetes/kubernetes/pull/99581
+- https://github.com/kubernetes/kubernetes/pull/99833
 
 ## Drawbacks
 

keps/sig-cli/2227-kubectl-default-container/kep.yaml

@@ -6,6 +6,7 @@ owning-sig: sig-cli
 participating-sigs:
 status: implementable
 creation-date: 2020-12-16
+last-updated: 2021-03-10
 reviewers:
   - "@dougsland"
   - "@eddiezane"