* kubeadm: Implemented preflight check to ensure that number of CPUs ([#70048](https://github.com/kubernetes/kubernetes/pull/70048), [@bart0sh](https://github.com/bart0sh))
    * on the master node is not less than required.

### Cluster Lifecycle

- kubeadm: fixed nil pointer dereference caused by a bug in url parsing ([#74454](https://github.com/kubernetes/kubernetes/pull/74454), [@bart0sh](https://github.com/bart0sh))

- Kubeadm: implemented structured output of 'kubeadm config images list' command in JSON, YAML, Go template and JsonPath formats ([#86810](https://github.com/kubernetes/kubernetes/pull/86810), [@bart0sh](https://github.com/bart0sh)) [SIG Cluster Lifecycle]

- kubeadm: produce errors if they occur when resetting cluster status for a control-plane node ([#80573](https://github.com/kubernetes/kubernetes/pull/80573), [@bart0sh](https://github.com/bart0sh))

- kubeadm: You can now delete multiple bootstrap tokens at once. ([#75646](https://github.com/kubernetes/kubernetes/pull/75646), [@bart0sh](https://github.com/bart0sh))
- util/initsystem: Added support for the OpenRC init system ([#73101](https://github.com/kubernetes/kubernetes/pull/73101), [@oz123](https://github.com/oz123))

- Dynamic Resource Allocation: logged an error and submitted an event when `Kubelet` failed to prepare dynamic resources. ([#118578](https://github.com/kubernetes/kubernetes/pull/118578), [@bart0sh](https://github.com/bart0sh))
- Ensure Job status updates are batched by 1s. This fixes an unlikely scenario when a sequence of immediately 

- Kubeadm: implemented structured output of 'kubeadm token list' in JSON, YAML, Go template and JsonPath formats ([#78764](https://github.com/kubernetes/kubernetes/pull/78764), [@bart0sh](https://github.com/bart0sh))

## Changelog since v1.12.5

### Other notable changes

* kubeadm: fixed nil pointer dereference caused by a bug in url parsing ([#74454](https://github.com/kubernetes/kubernetes/pull/74454), [@bart0sh](https://github.com/bart0sh))

- `DevicePluginCDIDevices` feature has been graduated to `beta` and enabled by default in the kubelet. ([#121254](https://github.com/kubernetes/kubernetes/pull/121254), [@bart0sh](https://github.com/bart0sh))
- `ValidatingAdmissionPolicy` now preserves types of composition variables, and raises type-related errors early. ([#121001](https://github.com/kubernetes/kubernetes/pull/121001), [@jiahuif](https://github.com/jiahuif))

- Graduated the `WatchList` feature gate to beta for kube-apiserver and enabled `WatchListClient` for kube-controller-manager (KCM). ([#125591](https://github.com/kubernetes/kubernetes/pull/125591), [@p0lyn0mial](h...