- kube-apiserver: setting a `dryRun` query parameter on a CONNECT request will now cause the request to be rejected, consistent with behavior of other mutating API requests. Examples of CONNECT APIs are the `nodes/proxy`, `services/proxy`, `pods/proxy`, `pods/exec`, and `pods/attach` subresources. Note that this prevents sending a `dryRun` parameter to backends via `{nodes,services,pods}/proxy` subresources. ([#66083](https://githu...

- kube-conformance image will now run ginkgo with the `--dryRun` flag if the container is run with the environment variable E2E_DRYRUN set. ([#74731](https://github.com/kubernetes/kubernetes/pull/74731), [@johnSchnake](https://github.com/johnSchnake))

* Created a new `dryRun` query parameter for mutating endpoints. If the parameter is set, then the query will be rejected, as the feature is not implemented yet. This will allow forward compatibility with future clients; otherwise, future clients talking with older apiservers might end up modifying a resource even if they include the `dryRun` query parameter. ([#63557](https://github.com/kubernetes/kubernetes/pull/63557), [@ap...

- Fixed client cert setup in delegating authentication logic ([#69430](https://github.com/kubernetes/kubernetes/pull/69430), [@DirectXMan12](https://github.com/DirectXMan12))
- OpenAPI spec and API reference now reflect dryRun query parameter for POST/PUT/PATCH operations ([#69359](https://github.com/kubernetes/kubernetes/pull/69359), [@roycaihw](https://github.com/roycaihw))