- kubeadm's kube-apiserver Pod manifest now includes the following flags by default "--service-account-key-file", "--service-account-signing-key-file", "--service-account-issuer". ([#93258](https://github.com/kubernetes/kubernetes/pull/93258), [@zshihang](https://github.com/zshihang))...

*   It is now possible to set multiple manifest URL headers with the kubelet's `--manifest-url-header` flag. Multiple headers for the same key will be added in the order provided. The ManifestURLHeader field in KubeletConfiguration object (kubeletconfig/v1alpha1) is now a map[string][]string, which facilitates writing...

* Restores the ability to apply network policy objects against the networking.k8s.io/v1 API ([#54106](https://github.com/kubernetes/kubernetes/pull/54106), [@liggitt](https://github.com/liggitt))
* Allow for configuring etcd hostname in the manifest ([#54403](https://github.com/kubernetes/kubernetes/pull/54403), [@wojtek-t](https://github.com/wojtek-t))

* Added the `kubeadm upgrade diff` command to show how static pod manifests will be changed by an upgrade. This command shows the changes that will be made to the static pod manifests before applying them. This is a narrower case than kubeadm upgrade apply --dry-run, which specifically focuses on the static pod manifests. ([#63930](https://github.com/kubernetes/kubernetes/pull/63930), [@liztio](https://github.com/liztio))

`federation-controller-manager` are now folded in to the `hyperkube` binary. If you were using one of these binaries or docker images, please switch to using the `hyperkube` version. Please refer to the federation manifests - `federation/manifests/federation-apiserver.yaml` and `federation/manifests/federation-controller-manager-deployment.yaml` for examples. ([#29929](https://github.com/kubernetes/kubernetes/pull/29929), [@madhusudancs](https://github.com/madhusudancs))

### Other notable changes...

- Restores priority of static control plane pods in the cluster/gce/manifests control-plane manifests ([#89970](https://github.com/kubernetes/kubernetes/pull/89970), [@liggitt](https://github.com/liggitt)) [SIG Cluster Lifecycle and Node]

### Other (Cleanup or Flake)

  </mime-type>

  <mime-type type="application/json">
    <sub-class-of type="text/javascript"/>
    <glob pattern="*.json"/>
  </mime-type>

  <mime-type type="application/manifest+json">
    <_comment>Web Application Manifest file</_comment>
    <sub-class-of type="application/json"/>
    <glob pattern="*.webmanifest"/>
  </mime-type>

  <mime-type type="application/java-vm">

## Changelog since v1.8.1

### Other notable changes

* Allow for configuring etcd hostname in the manifest ([#54403](https://github.com/kubernetes/kubernetes/pull/54403), [@wojtek-t](https://github.com/wojtek-t))

### (No, really, you MUST read this before you upgrade)

#### Cluster Lifecycle

- Container images tar files for `amd64` will now contain the architecture in the RepoTags manifest.json section.
  If you are using docker manifests there are not visible changes. ([#80266](https://github.com/kubernetes/kubernetes/pull/80266), [@javier-b-perez](https://github.com/javier-b-perez))

- Restores priority of static control plane pods in the cluster/gce/manifests control-plane manifests ([#89970](https://github.com/kubernetes/kubernetes/pull/89970), [@liggitt](https://github.com/liggitt)) [SIG Cluster Lifecycle and Node]