* Fixed regression in initial kubectl exec terminal dimensions ([#51127](https://github.com/kubernetes/kubernetes/pull/51127), [@chen-anders](https://github.com/chen-anders))

This release also contains a number of bug fixes to the feature set. Aspiring plugin authors can look at [sample-exec-plugin](https://github.com/ankeesler/sample-exec-plugin) as a way to get started.

### Bug or Regression

- Fix an ephemeral port exhaustion bug caused by improper connection management that occurred when a large number of objects were handled by kubectl while exec auth was in use. ([#112337](https://github.com/kubernetes/kubernetes/pull/112337), [@enj](https://github.com/enj)) [SIG API Machinery and Auth]

## Urgent Upgrade Notes 

### (No, really, you MUST read this before you upgrade)

kubernetes/kubernetes/pull/58973), [@verb](https://github.com/verb))

* The default Flexvolume plugin directory for COS images on GCE has changed to `/home/kubernetes/flexvolume`, rather than `/etc/srv/kubernetes/kubelet-plugins/volume/exec`. Existing Flexvolume installations in clusters using COS images must be moved to the new directory, and installation processes must be updated with the new path. ([#58171](https://github.com/kubernetes/kubernetes/pull/58171), [@verult](https://github.com/verult))...

* The priorityClass feature is now considered beta. ([#63724](https://github.com/kubernetes/kubernetes/pull/63724), [@ravisantoshgudimetla](https://github.com/ravisantoshgudimetla))
* client-go: credential exec plugins is now considered beta. ([#64482](https://github.com/kubernetes/kubernetes/pull/64482), [@ericchiang](https://github.com/ericchiang))

- Changed the error message to `cannot exec into multiple objects at a time` when file passed to `kubectl exec` contains multiple resources ([#114249](https://github.com/kubernetes/kubernetes/pull/114249), [@ardaguclu](https://github.com/ardaguclu))

- The `--pod` flag (`-p` shorthand) of the kubectl exec command has been marked as deprecated, and will be removed in a future version. This flag is currently optional. ([#66558](https://github.com/kubernetes/kubernetes/pull/66558), [@quasoft](https://github.com/quasoft))

- Fixes a 1.30+ regression in connection stability for exec / attach / portforward requests initiated using a websocket client ([#130253](https://github.com/kubernetes/kubernetes/pull/130253), [@fuweid](https://github.com/fuweid)) [SIG API Machinery, CLI and Testing]

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