- Added apiserver_envelope_encryption_invalid_key_id_from_status_total to measure number of times an invalid keyID is returned by the Status RPC call. ([#115846](https://github.com/kubernetes/kubernetes/pull/115846), [@ritazh](https://github.com/ritazh)) [SIG API Machinery and Auth]

    *  - `kubernetes` plugin adds metrics to measure kubernetes control plane latency.
    *  -  the `health` plugin now includes the `lameduck` option by default, which waits for a duration before shutting down.
* Kubeadm now includes CoreDNS version 1.6.5 ([#85108](https://github.com/kubernetes/kubernetes/pull/85108), [@rajansandeep](https://github.com/rajansandeep))
    *  - `kubernetes` plugin adds metrics to measure kubernetes control plane latency.

- Added `apiserver_envelope_encryption_dek_cache_filled` to measure number of records in data encryption key (DEK) cache. ([#119878](https://github.com/kubernetes/kubernetes/pull/119878), [@ritazh](https://github.com/ritazh))

* kubeadm - Ensure the peer port is secured by explicitly setting the peer URLs for the default etcd instance. ([#64988](https://github.com/kubernetes/kubernetes/pull/64988), [@detiber](https://github.com/detiber))
    * kubeadm - Ensure that the etcd certificates are generated using a proper CN

* Ensure directories on volumes are group-executable when using fsGroup ([#73533](https://github.com/kubernetes/kubernetes/pull/73533), [@mxey](https://github.com/mxey))

* fix azure disk attachment error on Linux ([#70002](https://github.com/kubernetes/kubernetes/pull/70002), [@andyzhangx](https://github.com/andyzhangx))
* Ensure orphan public IPs on Azure deleted when service recreated with the same name. ([#70463](https://github.com/kubernetes/kubernetes/pull/70463), [@feiskyer](https://github.com/feiskyer))

  // More info: https://kubernetes.io/docs/concepts/storage/volumes#awselasticblockstore
  optional string volumeID = 1;

  // fsType is the filesystem type of the volume that you want to mount.
  // Tip: Ensure that the filesystem type is supported by the host operating system.
  // Examples: "ext4", "xfs", "ntfs". Implicitly inferred to be "ext4" if unspecified.

* Kubernetes 1.12 also enables [Kubelet device plugin registration](https://github.com/kubernetes/enhancements/issues/595) feature by default. Before upgrading to 1.12, ensure the `driver-registrar` CSI sidecar container for your CSI driver is configured to handle...

- Ensure all vSphere nodes are are tracked by volume attach-detach controller ([#96689](https://github.com/kubernetes/kubernetes/pull/96689), [@gnufied](https://github.com/gnufied))
- Ensure empty string annotations are copied over in rollbacks. ([#94858](https://github.com/kubernetes/kubernetes/pull/94858), [@waynepeking348](https://github.com/waynepeking348))

* Ensure IP is set for Azure internal load balancer. ([#59083](https://github.com/kubernetes/kubernetes/pull/59083), [@feiskyer](https://github.com/feiskyer))