- The deprecated `--etcd-quorum-read` flag has been removed. Quorum reads are now always enabled when fetching data from etcd. Remove the `--etcd-quorum-read` flag from kube-apiserver invocations before upgrading.
- kube-controller-manager

Introduce KMS v2alpha1 API to add performance, rotation, and observability improvements. Encrypt data at rest (ie Kubernetes `Secrets`) with DEK using AES-GCM instead of AES-CBC for kms data encryption. No user action is required. Reads with AES-GCM and AES-CBC will continue to be allowed. See the guide [Using a KMS provider for data encryption](https://kubernetes.io/docs/tasks/administer-cluster/kms-provider/) for more information.

- kubeadm: Fixed the machine readability of `kubeadm token create --print-join-command` ([#75487](https://github.com/kubernetes/kubernetes/pull/75487), [@displague](https://github.com/displague))
- `kubeadm alpha certs renew --csr-only` now reads the current certificates as the authoritative source for certificates attributes (same as kubeadm alpha certs renew). ([#77780](https://github.com/kubernetes/kubernetes/pull/77780), [@fabriziopandini](https://github.com/fabriziopandini))

  <mime-type type="application/vnd.mophun.certificate">
    <glob pattern="*.mpc"/>
  </mime-type>
  <mime-type type="application/vnd.motorola.flexsuite"/>
  <mime-type type="application/vnd.motorola.flexsuite.adsi"/>
  <mime-type type="application/vnd.motorola.flexsuite.fis"/>
  <mime-type type="application/vnd.motorola.flexsuite.gotap"/>
  <mime-type type="application/vnd.motorola.flexsuite.kmr"/>