- Display the usage of ephemeral-storage when using `kubectl describe node` ([#70268](https://github.com/kubernetes/kubernetes/pull/70268), [@Pingan2017](https://github.com/Pingan2017))
- Added functionality to enable br_netfilter and ip_forward for debian packages to improve kubeadm support for CRI runtime besides Docker.  ([#70152](https://github.com/kubernetes/kubernetes/pull/70152), [@ashwanikhemani](https://github.com/ashwanikhemani))

- Added a path `/header?key=` to `agnhost netexec` allowing one to view what the header value is of the incoming request.

  Ex:
  ```
  $ curl -H "X-Forwarded-For: something" 172.17.0.2:8080/header?key=X-Forwarded-For
  something
  ```
   ([#107796](https://github.com/kubernetes/kubernetes/pull/107796), [@alexanderConstantinescu](https://github.com/alexanderConstantinescu))

- Kubeadm now forwards the IPv6DualStack feature gate using the kubelet component config, instead of the kubelet command line ([#90840](https://github.com/kubernetes/kubernetes/pull/90840), [@rosti](https://github.com/rosti)) [SIG Cluster Lifecycle]

## Dependencies

### Added

### Other (Cleanup or Flake)

* Update to go 1.12.10 ([#83139](https://github.com/kubernetes/kubernetes/pull/83139), [@cblecker](https://github.com/cblecker))
* Use ipv4 in wincat port forward. ([#83036](https://github.com/kubernetes/kubernetes/pull/83036), [@liyanhui1228](https://github.com/liyanhui1228))

images. The old registry (`k8s.gcr.io`) will continue to be supported for the foreseeable future, but the new name should perform better because it frontends equivalent mirrors in other clouds.  Please point your clusters to the new registry going forward. \n\nAdmission/Policy integrations that have an allowlist of registries need to include `registry.k8s.io` alongside `k8s.gcr.io`.\nAir-gapped environments and image garbage-collection configurations will need to update to pre-pull and preserve required...

- Kubectl port-forward service will now properly exit when the attached pod dies (#103526, @brianpursley) [SIG API Machinery]
- Kubelet: fixes a file descriptor leak in log rotation (#106382, @rphillips) [SIG Node]

* Use full package path for definition name in OpenAPI spec ([#40124](https://github.com/kubernetes/kubernetes/pull/40124), [@mbohlool](https://github.com/mbohlool))
* Follow redirects for streaming requests (exec/attach/port-forward) in the apiserver by default (alpha -> beta). ([#40039](https://github.com/kubernetes/kubernetes/pull/40039), [@timstclair](https://github.com/timstclair))

   ([#123341](https://github.com/kubernetes/kubernetes/pull/123341), [@neolit123](https://github.com/neolit123))
- kubectl `port-forward` over websockets (tunneling SPDY) can now be enabled using an `Alpha` feature flag environment variable: KUBECTL_PORT_FORWARD_WEBSOCKETS=true. The API Server being communicated to must *also* have an `Alpha` feature flag enabled: PortForwardWebsockets.