### Deprecation

#### kube-apiserver:
- the following deprecated APIs can no longer be served:
  - All resources under `apps/v1beta1` and `apps/v1beta2` - use `apps/v1` instead
  - `daemonsets`, `deployments`, `replicasets` resources under `extensions/v1beta1` - use `apps/v1` instead
  - `networkpolicies` resources under `extensions/v1beta1` - use `networking.k8s.io/v1` instead

- Previous versions of Kubernetes on Google Cloud required that workloads (e.g. Deployments, DaemonSets, etc.) which used `PersistentDisk` volumes were using them in read-only mode.  This validation provided very little value at relatively host implementation cost, and will no longer be validated.  If this is a problem for a specific use-case,...

### Bug or Regression

- (PodSecurity admission) errors validating workload resources (deployment, replicaset, etc.) no longer block admission. ([#106017](https://github.com/kubernetes/kubernetes/pull/106017), [@tallclair](https://github.com/tallclair)) [SIG Auth]

With cluster-wide seccomp defaults, the kubelet uses the `RuntimeDefault` seccomp profile by default, rather than than `Unconfined`. This allows enhancing the default cluster wide workload security of the Kubernetes deployment. Security administrators will now sleep better knowing there is some security by default for the workloads.

	}
	return nil
}

// validatePodSpecSecurityContext verifies the SecurityContext of a PodSpec,
// whether that is defined in a Pod or in an embedded PodSpec (e.g. a
// Deployment's pod template).
func validatePodSpecSecurityContext(securityContext *core.PodSecurityContext, spec *core.PodSpec, specPath, fldPath *field.Path, opts PodValidationOptions) field.ErrorList {
	allErrs := field.ErrorList{}

"storageCapacity indicates that the CSI volume driver wants pod scheduling to consider the storage capacity that the driver deployment will report by creating CSIStorageCapacity objects with capacity information, if set to true.\n\nThe check can be enabled immediately when deploying a driver. In that case, provisioning new volumes with late binding will pause until the driver deployment has published some suitable CSIStorageCapacity object.\n\nAlternatively, the driver can be deployed with the field unset...

  select the same set of Pods, scaling now will be disabled for those HPAs with
  the reason `AmbiguousSelector`. This change also covers a case when multiple HPAs
  point to the same deployment.'
   ([#112011](https://github.com/kubernetes/kubernetes/pull/112011), [@pbeschetnov](https://github.com/pbeschetnov))
- 'Pod Security admission: the pod-security `warn` level will now default to
  the `enforce` level.'

- The deprecated kube-controller-manager flag '--deployment-controller-sync-period' has been removed, it is not used by the deployment controller. ([#107178](https://github.com/kubernetes/kubernetes/pull/107178), [@SataQiu](https://github.com/SataQiu))

  PodSubnet validates against the corresponding cluster "--node-cidr-mask-size" of the kube-controller-manager, it fail if the values are not compatible.
  kubeadm no longer sets the node-mask automatically on IPv6 deployments, you must check that your IPv6 service subnet mask is compatible with the default node mask /64 or set it accordingly.

- The TopologySpreadConstraints will be shown in describe command for pods, deployments, daemonsets, etc. ([#109563](https://github.com/kubernetes/kubernetes/pull/109563), [@ardaguclu](https://github.com/ardaguclu))