limit.
 *  Fix: Avoid using invalid HTTPS sessions. This prevents OkHttp from crashing
    with the error, `Unexpected TLS version: NONE`.
 *  Fix: Don't corrupt the response cache when a 304 (Not Modified) response
    overrides the stored "Content-Encoding" header.
 *  Fix: Gracefully shut down the HTTP/2 connection before it exhausts the

- APIService availability related to networking glitches are corrected faster ([#68678](https://github.com/kubernetes/kubernetes/pull/68678), [@deads2k](https://github.com/deads2k))

- kubectl

accessing the same cache directory simultaneously. Most applications should call `new OkHttpClient()` exactly once, configure it with their cache, and use that same instance everywhere. Otherwise the two cache instances will stomp on each other, corrupt the response cache, and possibly crash your program.

Response caching uses HTTP headers for all configuration. You can add request headers like `Cache-Control: max-stale=3600` and OkHttp's cache will honor them. Your webserver configures...

- Corrected the documentation to clarify that `podSelector` is optional and described its default behavior. ([#131354](https://github.com/kubernetes/kubernetes/pull/131354), [@tomoish](https://github.com/tomoish))

* Fix a scalability issue where high rates of event writes degraded etcd performance. ([#64539](https://github.com/kubernetes/kubernetes/pull/64539), [@ccding](https://github.com/ccding))
* Corrected a mistake in the documentation for wait.PollImmediate(...) ([#65026](https://github.com/kubernetes/kubernetes/pull/65026), [@spew](https://github.com/spew))

* API server properly parses propagationPolicy as a query parameter sent with a delete request ([#63414](https://github.com/kubernetes/kubernetes/pull/63414), [@roycaihw](https://github.com/roycaihw))
* Corrected a race condition in bootstrapping aggregated cluster roles in new HA clusters ([#63761](https://github.com/kubernetes/kubernetes/pull/63761), [@liggitt](https://github.com/liggitt))

  - Published OpenAPI for the StatefulSet schema is corrected to indicate the `.spec.serviceName` is optional. ([#130233](https://github.com/kubernetes/kubernetes/pull/130233), [@soltysh](https://github.com/soltysh)) [SIG API Machinery, Apps and Testing]

## Changes by Kind

### API Change

- Protobuf serialization of metav1.MicroTime timestamps (used in `Lease` and `Event` API objects) has been corrected to truncate to microsecond precision, to match the documented behavior and JSON/YAML serialization. Any existing persisted data is truncated to microsecond when read from etcd. ([#111936](https://github.com/kubernetes/kubernetes/pull/111936), [@...