- Promoted API groups `ValidatingAdmissionPolicy` and `ValidatingAdmissionPolicyBinding` to `v1beta1`. ([#118644](https://github.com/kubernetes/kubernetes/pull/118644), [@alexzielenski](https://github.com/alexzielenski)) [SIG API Machinery, Apps and Testing]

func (tw *Writer) WriteHeader(hdr *Header) error {
	if err := tw.Flush(); err != nil {
		return err
	}
	tw.hdr = *hdr // Shallow copy of Header

	// Avoid usage of the legacy TypeRegA flag, and automatically promote
	// it to use TypeReg or TypeDir.
	if tw.hdr.Typeflag == TypeRegA {
		if strings.HasSuffix(tw.hdr.Name, "/") {
			tw.hdr.Typeflag = TypeDir
		} else {
			tw.hdr.Typeflag = TypeReg
		}
	}

// should do so by creating a new Header and copying the fields
// that they are interested in preserving.
type Header struct {
	// Typeflag is the type of header entry.
	// The zero value is automatically promoted to either TypeReg or TypeDir
	// depending on the presence of a trailing slash in Name.
	Typeflag byte

	Name     string // Name of file entry
	Linkname string // Target name of link (valid for TypeLink or TypeSymlink)

- NodeAffinity plugin can be configured with AddedAffinity. ([#96202](https://github.com/kubernetes/kubernetes/pull/96202), [@alculquicondor](https://github.com/alculquicondor)) [SIG Node, Scheduling and Testing]
- Promote RuntimeClass feature to GA.
  Promote node.k8s.io API groups from v1beta1 to v1. ([#95718](https://github.com/kubernetes/kubernetes/pull/95718), [@SergeyKanzhelev](https://github.com/SergeyKanzhelev)) [SIG Apps, Auth, Node, Scheduling and Testing]

### Auth

* [GA] The RBAC API group has been promoted from v1beta1 to v1. No API changes were introduced.

* [beta] Advanced auditing has been promoted from alpha to beta. The webhook and logging policy formats have changed since alpha, and may require modification.

* Added pods-per-core to kubelet. [#25762](https://github.com/kubernetes/kubernetes/pull/25762) ([#25813](https://github.com/kubernetes/kubernetes/pull/25813), [@rrati](https://github.com/rrati))
* promote sourceRange into service spec ([#25826](https://github.com/kubernetes/kubernetes/pull/25826), [@freehan](https://github.com/freehan))

				},
		*/
	}, {
		file: "testdata/trailing-slash.tar",
		tests: []testFnc{
			testHeader{Header{Name: strings.Repeat("123456789/", 30)}, nil},
			testClose{nil},
		},
	}, {
		// Automatically promote zero value of Typeflag depending on the name.
		file: "testdata/file-and-dir.tar",
		tests: []testFnc{
			testHeader{Header{Name: "small.txt", Size: 5}, nil},
			testWrite{"Kilts", 5, nil},

### Other (Cleanup or Flake)

- 'Promoted `cronjob_job_creation_skew` metric to stable to follow the cronjob v2 controller,
  the following metrics had their name updated to match metrics API guidelines:
    - `cronjob_job_creation_skew_duration_seconds` -> `job_creation_skew_duration_seconds`.' ([#113008](https://github.com/kubernetes/kubernetes/pull/113008), [@soltysh](https://github.com/soltysh))

### Authentication
* The authentication.k8s.io API group was promoted to v1([#41058](https://github.com/kubernetes/kubernetes/pull/41058), [@liggitt](https://github.com/liggitt))

### Authorization
* The authorization.k8s.io API group was promoted to v1 ([#40709](https://github.com/kubernetes/kubernetes/pull/40709), [@liggitt](https://github.com/liggitt))

## **Action Required Before Upgrading**

### Network