* Fix ceph-secret type to kubernetes.io/rbd in kubernetes-master charm ([#44635](https://github.com/kubernetes/kubernetes/pull/44635), [@Cynerva](https://github.com/Cynerva))

  * Disallows installation of upstream docker from PPA in the Juju kubernetes-worker charm. ([#44681](https://github.com/kubernetes/kubernetes/pull/44681), [@wwwtyro](https://github.com/wwwtyro))

	allErrs = append(allErrs, ValidateNonSpecialIP(address.IP, fldPath.Child("ip"))...)
	return allErrs
}

// ValidateNonSpecialIP is used to validate Endpoints, EndpointSlices, and
// external IPs. Specifically, this disallows unspecified and loopback addresses
// are nonsensical and link-local addresses tend to be used for node-centric
// purposes (e.g. metadata service).
//
// IPv6 references

}

switch {
case x < y: f1()
case x < z: f2()
case x == 4: f3()
}
</pre>

<p>
Implementation restriction: A compiler may disallow multiple case
expressions evaluating to the same constant.
For instance, the current compilers disallow duplicate integer,
floating point, or string constants in case expressions.
</p>

<h4 id="Type_switches">Type switches</h4>

<p>

* Disallow PriorityClass names with 'system-' prefix for user defined priority classes. ([#59382](https://github.com/kubernetes/kubernetes/pull/59382), [@bsalamat](https://github.com/bsalamat))

### SIG API Machinery

This release SIG API Machinery focused mainly on CustomResources. For example, subresources for CustomResources are now beta and enabled by default. With this, updates to the `/status` subresource will disallow updates to all fields other than `.status` (not just `.spec` and `.metadata` as before). Also, `required` and `description` can be used at the root of the CRD OpenAPI validation schema when the `/status` subresource is enabled.

			Served:  true,
			Storage: true,
		},
	}
	tests := []struct {
		name     string
		resource *apiextensions.CustomResourceDefinition
		errors   []validationMatch
	}{
		{
			name: "invalid types disallowed",
			resource: &apiextensions.CustomResourceDefinition{
				ObjectMeta: metav1.ObjectMeta{Name: "plural.group.com"},
				Spec: apiextensions.CustomResourceDefinitionSpec{
					Group: "group.com",

  //   allows any non-core object, as well as PersistentVolumeClaim objects.
  // * While dataSource ignores disallowed values (dropping them), dataSourceRef
  //   preserves all values, and generates an error if a disallowed value is
  //   specified.
  // * While dataSource only allows local objects, dataSourceRef allows objects
  //   in any namespaces.

	//   allows any non-core object, as well as PersistentVolumeClaim objects.
	// * While dataSource ignores disallowed values (dropping them), dataSourceRef
	//   preserves all values, and generates an error if a disallowed value is
	//   specified.
	// * While dataSource only allows local objects, dataSourceRef allows objects
	//   in any namespaces.

and dataSourceRef: * While dataSource only allows two specific types of objects, dataSourceRef\n  allows any non-core object, as well as PersistentVolumeClaim objects.\n* While dataSource ignores disallowed values (dropping them), dataSourceRef\n  preserves all values, and generates an error if a disallowed value is\n  specified.\n* While dataSource only allows local objects, dataSourceRef allows objects\n  in any namespaces.\n(Beta) Using this field requires the AnyVolumeDataSource feature gate to...

- The `NodeConfiguration` kind in the kubeadm v1alpha2 API has been renamed `JoinConfiguration`...