- `pod.Spec.RuntimeClassName` field is now available in kubectl describe command. ([#110914](https://github.com/kubernetes/kubernetes/pull/110914), [@yeahdongcn](https://github.com/yeahdongcn))

### Other (Cleanup or Flake)

* add  `kubectl replace --raw` and `kubectl delete --raw` to have parity with create and get ([#79724](https://github.com/kubernetes/kubernetes/pull/79724), [@deads2k](https://github.com/deads2k))
* E2E tests no longer add command line flags directly to the command line, test suites that want that need to be updated if they don't use HandleFlags ([#75593](https://github.com/kubernetes/kubernetes/pull/75593), [@pohly](https://github.com/pohly))

    * kubeadm: use the default kubeconfig (/etc/kubernetes/admin.conf) for "kubeadm reset" and "kubeadm upgrade" commands.

- Fixed the API comments for the Job `Ready` field in status. ([#121765](https://github.com/kubernetes/kubernetes/pull/121765), [@mimowo](https://github.com/mimowo))
- Fixed the API comments for the `FailIndex` Job pod failure policy action. ([#121764](https://github.com/kubernetes/kubernetes/pull/121764), [@mimowo](https://github.com/mimowo))

### Other notable changes

* Trusty: Add retry in curl commands ([#24749](https://github.com/kubernetes/kubernetes/pull/24749), [@andyzheng0831](https://github.com/andyzheng0831))

* Get command uses OpenAPI schema to enhance display for a resource if run with flag 'use-openapi-print-columns'.  ([#46235](https://github.com/kubernetes/kubernetes/pull/46235), [@droot](https://github.com/droot))
    * An example command:
    * kubectl get pods --use-openapi-print-columns

### kubectl rolling-update: < v1.4.0 client vs >=v1.4.0 cluster

Old version kubectl's rolling-update command is compatible with Kubernetes 1.4 and higher only if you specify a new replication controller name. You will need to update to kubectl 1.4 or higher to use the rolling update command against a 1.4 cluster if you want to keep the original name, or you'll have to do two rolling updates.

  - Server-side feature gate: `TranslateStreamCloseWebsocketRequests`
  - Client-side (kubectl) feature gate: `KUBECTL_REMOTE_COMMAND_WEBSOCKETS`
  - To disable RemoteCommand over WebSockets for kubectl, the environment variable feature gate must be explicitly set to `false`: `KUBECTL_REMOTE_COMMAND_WEBSOCKETS=false`.
   ([#123281](https://github.com/kubernetes/kubernetes/pull/123281), [@seans3](https://github.com/seans3))

- Added categories column to the `kubectl api-resources` command's wide output (`-o wide`).