* Pods are placed under a new cgroup hierarchy by default. This feature requires
    draining and restarting the node as part of upgrades. To opt-out set
    `--cgroups-per-qos=false`.
  * If `kube-reserved` and/or `system-reserved` are specified, node allocatable
    will be enforced on all pods by default. To opt-out set
    `--enforce-node-allocatable=””`
  * Hard Eviction Thresholds will be subtracted from Capacity while calculating

Network

* NetworkPolicy has been promoted from 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...

- Watch will now support converting response objects...

    - [Skip Volume Ownership change graduates to GA](#skip-volume-ownership-change-graduates-to-ga)
    - [Allow CSI drivers to opt-in to volume ownership and permission change graduates to GA](#allow-csi-drivers-to-opt-in-to-volume-ownership-and-permission-change-graduates-to-ga)
    - [PodSecurity graduates to Beta](#podsecurity-graduates-to-beta)

  Until kubeadm supports the userns functionality out of the box, users can continue using the deprecated  `RootlessControlPlane` feature gate, or  opt-in `UserNamespacesSupport` by using kubeadm patches on the static pod manifests. ([#124997](https://github.com/kubernetes/kubernetes/pull/124997), [@neolit123](https://github.com/neolit123)) [SIG Cluster Lifecycle]

### Cluster-wide seccomp defaults

### **Cluster Lifecycle**

*   You must either specify the `--discovery-token-ca-cert-hash` flag to `kubeadm join`, or opt out of the CA pinning feature using `--discovery-token-unsafe-skip-ca-verification`.
*   The default `auto-detect` behavior of the kubelet's `--cloud-provider` flag is removed.

- Respect annotation size limit for server-side apply updates to the client-side apply annotation. Also, fix opt-out of this behavior by setting the client-side apply annotation to the empty string. ([#102105](https://github.com/kubernetes/kubernetes/pull/102105), [@julianvmodesto](https://github.com/julianvmodesto)) [SIG API Machinery]

- CoreDNS is now the default DNS server in kube-up deployments.  ([#69883](https://github.com/kubernetes/kubernetes/pull/69883), [@chrisohaver](https://github.com/chrisohaver))
- Opt out of chowning and chmoding from kubectl cp. ([#69573](https://github.com/kubernetes/kubernetes/pull/69573), [@bjhaid](https://github.com/bjhaid))

    Note over client,operation: Response is already sent, can't change it anymore
    opt Tasks
        operation -->> tasks: Send background tasks
    end
    opt Raise other exception
        tasks -->> dep: Raise other exception
    end
    Note over dep: After yield
    opt Handle other exception
        dep -->> dep: Handle exception, can't change response. E.g. close DB session.
    end