- Deprecate `--record` flag in `kubectl`. The `--record` flag is being replaced with the [mechanism](https://github.com/kubernetes/enhancements/tree/master/keps/sig-cli/859-kubectl-headers) which annotates HTTP requests with kubectl command details. ([#102873](https://github.com/kubernetes/kubernetes/pull/102873), [@soltysh](https://github.com/soltysh))...

- Added a mechanism for configurable container restarts: _container-level restart rules_. This was an alpha feature behind the `ContainerRestartRules` feature gate. ([#132642](https://github.com/kubernetes/kubernetes/pull/132642), [@yuanwang04](https://github.com/yuanwang04))...

- Added the correct error when eviction is blocked due to the failSafe mechanism of the `DisruptionController`. ([#133097](https://github.com/kubernetes/kubernetes/pull/133097), [@kei01234kei](https://github.com/kei01234kei)) [SIG Apps and Node]

- Kubeadm: respect user specified image repository when using Kubernetes ci version ([#111017](https://github.com/kubernetes/kubernetes/pull/111017), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]
- Kubeadm: support retry mechanism for removing container in reset phase ([#110837](https://github.com/kubernetes/kubernetes/pull/110837), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]

* Federated DaemonSet controller. Supports all the API that regular DaemonSet has. ([#34319](https://github.com/kubernetes/kubernetes/pull/34319), [@mwielgus](https://github.com/mwielgus))
* New federation deployment mechanism now allows non-GCP clusters. ([#34620](https://github.com/kubernetes/kubernetes/pull/34620), [@madhusudancs](https://github.com/madhusudancs))
  * Writes the federation kubeconfig to the local kubeconfig file.

A <code>nil</code> map is equivalent to an empty map except that no elements
may be added.
</p>

<h3 id="Channel_types">Channel types</h3>

<p>
A channel provides a mechanism for
<a href="#Go_statements">concurrently executing functions</a>
to communicate by
<a href="#Send_statements">sending</a> and
<a href="#Receive_operator">receiving</a>
values of a specified element type.

* Added service annotation for AWS ELB SSL policy ([#54507](https://github.com/kubernetes/kubernetes/pull/54507), [@micahhausler](https://github.com/micahhausler))
* Implement correction mechanism for dangling volumes attached for deleted pods ([#55491](https://github.com/kubernetes/kubernetes/pull/55491), [@gnufied](https://github.com/gnufied))

#### GCE
* On GCI by default logrotate is disabled for application containers in favor of rotation mechanism provided by docker logging driver. ([#40634](https://github.com/kubernetes/kubernetes/pull/40634), [@crassirostris](https://github.com/crassirostris))

#### GKE

- Added a `/statusz` endpoint for kube-scheduler ([#128987](https://github.com/kubernetes/kubernetes/pull/128987), [@Henrywu573](https://github.com/Henrywu573)) [SIG Instrumentation, Scheduling and Testing]

- Add fish shell completion to kubectl. ([#92989](https://github.com/kubernetes/kubernetes/pull/92989), [@WLun001](https://github.com/WLun001))
- Add mechanism to load simple sniffer class into fluentd-elasticsearch image ([#92853](https://github.com/kubernetes/kubernetes/pull/92853), [@cosmo0920](https://github.com/cosmo0920))