- [`KT-58993`](https://youtrack.jetbrains.com/issue/KT-58993) [K/Wasm] Fix w3c declarations with lambda parameters
- [`KT-59722`](https://youtrack.jetbrains.com/issue/KT-59722) K/Wasm: Support new encoding with flags for br_on_cast and br_on_cast_fail instructions

  - The deprecated `--etcd-quorum-read` flag has been removed. Quorum reads are...

### Ephemeral Containers Graduate to Stable

  - `http_404_request_duration_ms` (the amount of time the server took to respond in ms)

  Also includes percentile groupings. The directory for the default 404 handler includes instructions on how to enable prometheus for monitoring and setting alerts.
  ([#79106](https://github.com/kubernetes/kubernetes/pull/79106), [@vbannai](https://github.com/vbannai))

### Instrumentation

  * Plugins

      * Introduces the ability to extend kubectl by adding third-party plugins. Developer preview, please refer to the documentation for instructions about how to use it. ([#37499](https://github.com/kubernetes/kubernetes/pull/37499), [@fabianofranz](https://github.com/fabianofranz))

- The new `-gce-zones` flag on the `e2e.test` binary instructs tests that check for information about how the cluster interacts with the cloud to limit their queries to the provided zone list. If not specified, the current behavior of asking the cloud provider for all available zones in multi zone clusters is...

- The `client.authentication.k8s.io/v1alpha1` ExecCredential has been removed. If you are using a client-go credential plugin that relies on the v1alpha1 API please contact the distributor of your plugin for instructions on how to migrate to the v1 API. ([#108616](https://github.com/kubernetes/kubernetes/pull/108616), [@margocrawf](https://github.com/margocrawf))

### Docs

* 📝 Update Uvicorn installation instructions to use uvicorn[standard] (includes uvloop). PR [#2543](https://github.com/tiangolo/fastapi/pull/2543) by [@tiangolo](https://github.com/tiangolo).

  // command  is root ('/') in the container's filesystem. The command is simply exec'd, it is
  // not run inside a shell, so traditional shell instructions ('|', etc) won't work. To use
  // a shell, you need to explicitly call out to that shell.
  // Exit status of 0 is treated as live/healthy and non-zero is unhealthy.
  // +optional
  repeated string command = 1;

* Marked scheduler's scheduling_duration_seconds Summary metric as deprecated ([#86586](https://github.com/kubernetes/kubernetes/pull/86586), [@xiaoanyunfei](https://github.com/xiaoanyunfei))
* Add instructions about how to bring up e2e test cluster ([#85836](https://github.com/kubernetes/kubernetes/pull/85836), [@YangLu1031](https://github.com/YangLu1031))