The annotation that informs about audit policy violations changed from `pod-security.kubernetes.io/audit` to `pod-security.kubernetes.io/audit-violation`. ([#105908](https://github.com/kubernetes/kubernetes/pull/105908), [@stlaz](https://github.com/stlaz))

- The status of v1beta1 CRDs without "preserveUnknownFields:false" now shows a violation, "spec.preserveUnknownFields: Invalid value: true: must be false". ([#93078](https://github.com/kubernetes/kubernetes/pull/93078), [@vareti](https://github.com/vareti))

physical memory on windows nodes. ([#57124](https://github.com/kubernetes/kubernetes/pull/57124), [@JiangtianLi](https://github.com/JiangtianLi))

* Windows containers now support experimental Hyper-V isolation by setting annotation `experimental.windows.kubernetes.io/isolation-type=hyperv` and feature gates HyperVContainer. At the moment this function only supports one container per pod. ([#58751](https://github.com/kubernetes/kubernetes/pull/58751), [@feiskyer](https://github.com/feiskyer))...

extensions/v1beta1 to the new networking.k8s.io/v1 API group. The structure remains unchanged from the v1beta1 API. The net.beta.kubernetes.io/network-policy annotation on Namespaces (used to opt in to isolation) has been removed. Instead, isolation is now determined on a per-pod basis. A NetworkPolicy may target a pod for isolation by including the pod in its spec.podSelector. Targeted Pods accept the traffic specified in the respective NetworkPolicy (and nothing else). Pods not targeted by any NetworkPolicy accept...

### Promoted Local Ephemeral Storage Capacity Isolation to Stable

- Replaced *_admission_latencies_milliseconds_summary and *_admission_latencies_milliseconds metrics because they were reporting seconds rather than milliseconds. They were also subject to multiple naming guideline violations (units should be in base units and "duration" is the best practice labelling to measure the time a request takes). Please convert to use *_admission_duration_seconds and *_admission_duration_seconds_summary, as these now report the unit as described,...

	`networking.k8s.io/v1` API group. The structure remains unchanged from
	the beta1 API.
	The `net.beta.kubernetes.io/network-policy` annotation on Namespaces
	to opt in to isolation has been removed. Instead, isolation is now
	determined at a per-pod level, with pods being isolated if there is
	any NetworkPolicy whose spec.podSelector targets them. Pods that are

- Promoted `LocalStorageCapacityIsolation` to beta; the behaviour is enabled by default. Within the kubelet, storage capacity isolation is active if the feature gate is enabled and the specific Pod is using a user namespace. ([#126014](https://github.com/kubernetes/kubernetes/pull/126014), [@PannagaRao](https://github.com/PannagaRao)) [SIG Apps, Autoscaling, Node, Storage and Testing]...

As an alpha feature, Kubernetes v1.22 can use the cgroups v2 API to control memory allocation and isolation. This feature is designed to improve workload and node availability when there is contention for memory resources.

### API changes and improvements for ephemeral containers