- Fixes a regression exposed in 1.27 by kubectl switching to openapi v3 by making apiregistration.k8s.io discoverable in openapi/v3 ([#119841](https://github.com/kubernetes/kubernetes/pull/119841), [@atiratree](https://github.com/atiratree)) [SIG API Machinery]

- CRI: exposed commit memory bytes in container stats specific to Windows ([#119238](https://github.com/kubernetes/kubernetes/pull/119238), [@kiashok](https://github.com/kiashok))
- Client-go now exposes two new metrics to monitor the client-go logic that
  generate http.Transports for the clients.
  

* Detach and clear bad disk URI ([#58345](https://github.com/kubernetes/kubernetes/pull/58345), [@rootfs](https://github.com/rootfs))
* Expose Metrics Server metrics via /metric endpoint. ([#57456](https://github.com/kubernetes/kubernetes/pull/57456), [@kawych](https://github.com/kawych))

### Bug or Regression

- The `--cidr-allocator-type` option set to `CloudAllocator` for `kube-controller-manager` will be deprecated and removed in a future release. Users are advised to transition to and explore the available options provided by their external cloud provider. ([#123011](https://github.com/kubernetes/kubernetes/pull/123011), [@dims](https://github.com/dims))

- The `SidecarContainers` feature has graduated to `beta` and is enabled by default. ([#121579](https://github.com/kubernetes/kubernetes/pull/121579), [@gjkim42](https://github.com/gjkim42))
- The `kube-apiserver` will now expose four new metrics to inform about errors on the clusterIP and nodePort allocation logic. ([#120843](https://github.com/kubernetes/kubernetes/pull/120843), [@aojea](https://github.com/aojea))

- Added validation for the --container-runtime-endpoint flag of kubelet to be non-empty. ([#112542](https://github.com/kubernetes/kubernetes/pull/112542), [@astraw99](https://github.com/astraw99)) [SIG Node]
- Expose health check SLI metrics on "metrics/slis" for apiserver ([#112741](https://github.com/kubernetes/kubernetes/pull/112741), [@logicalhan](https://github.com/logicalhan)) [SIG API Machinery, Architecture, Auth and Instrumentation]