* kubeadm will now pull required images during preflight checks if it cannot find them on the system. ([#641...

- Profiling can now be served on a unix-domain socket by using the `--profiling-path` option (when profiling is enabled) for security purposes. ([#114191](https://github.com/kubernetes/kubernetes/pull/114191), [@apelisse](https://github.com/apelisse)) [SIG API Machinery]

* Fix mounting of UNIX sockets(and other special files) in subpaths ([#61480](https://github.com/kubernetes/kubernetes/pull/61480), [@gnufied](https://github.com/gnufied))

- Migrate cmd/kubelet/+ pkg/kubelet/cadvisor/cadvisor_linux.go + pkg/kubelet/cri/remote/util/util_unix.go + pkg/kubelet/images/image_manager.go to structured logging ([#99994](https://github.com/kubernetes/kubernetes/pull/99994), [@AfrouzMashayekhi](https://github.com/AfrouzMashayekhi)) [SIG Instrumentation and Node]

* Support new NODE_OS_DISTRIBUTION 'custom' on GCE ([#61235](https://github.com/kubernetes/kubernetes/pull/61235), [@yguo0905](https://github.com/yguo0905))
* Fix mounting of UNIX sockets(and other special files) in subpaths ([#61480](https://github.com/kubernetes/kubernetes/pull/61480), [@gnufied](https://github.com/gnufied))

- kubeadm will now print required flags when running `kubeadm upgrade plan`.([#65802](https://github.com/kubernetes/kubernetes/pull/65802), [@xlgao-zju](https://github.com/xlgao-zju))
- Unix support for ZFS as a valid graph driver has been added for Docker, enabling users to use Kubeadm with ZFS. ([#65635](https://github.com/kubernetes/kubernetes/pull/65635), [@neolit123](https://github.com/neolit123))

### SIG GCP

- Enabled the `node-local` kubelet podresources API endpoint on windows, alongside unix. ([#115133](https://github.com/kubernetes/kubernetes/pull/115133), [@ffromani](https://github.com/ffromani))

    * - Don't generate empty record for externalName service.
    * - Add validation for upstreamNameserver port.
    * - Update go version to 1.9.3.
* Fix mounting of UNIX sockets(and other special files) in subpaths ([#61480](https://github.com/kubernetes/kubernetes/pull/61480), [@gnufied](https://github.com/gnufied))

   2. CacheSize type was changed from int32 to *int32. This allows defaulting logic to differentiate between cases where users explicitly supplied 0 vs. not supplied any value.
   3. KMS Provider's endpoint (path to Unix socket) is now validated when the EncryptionConfiguration files is loaded. This used to be handled by the GRPCService.

### Other notable changes

- Kubeadm: default the kubeadm configuration to the containerd socket (Unix: `unix:///var/run/containerd/containerd.sock`, Windows: `npipe:////./pipe/containerd-containerd`) instead of the one for Docker. If the `Init|JoinConfiguration.nodeRegistration.criSocket` field is empty during cluster creation and multiple sockets are...