- Replaced *_admission_latencies_milliseconds_summary and *_admission_latencies_milliseconds metrics because they were reporting seconds rather than milliseconds. They were also subject to multiple naming guideline violations (units should be in base units and "duration" is the best practice labelling to measure the time a request takes). Please convert to use *_admission_duration_seconds and *_admission_duration_seconds_summary,...

- Kubeadm: changed the "system:masters" Group in the apiserver-kubelet-client.crt certificate Subject to be "kubeadm:cluster-admins" which is a less privileged Group. ([#121837](https://github.com/kubernetes/kubernetes/pull/121837), [@neolit123](https://github.com/neolit123))

    * `kubectl auth can-i` now supports non-resource URLs ([#46432](https://github.com/kubernetes/kubernetes/pull/46432), [@CaoShuFeng](https://github.com/CaoShuFeng))

    * `kubectl set selector` and `kubectl set subject` no longer print "running in local/dry-run mode..." at the top.  The output can now be piped and interpretted as yaml or json ([#46507](https://github.com/kubernetes/kubernetes/pull/46507), [@bboreham](https://github.com/bboreham))

- Add auth API to get self subject attributes (new selfsubjectreviews API is added).