* Adds optional group and version information to the discovery interface, so that if an endpoint uses non-default values, the proper value of "kind" can be determined. Scale is a common example. ([#49971](https://github.com/kubernetes/kubernetes/pull/49971), [@deads2k](https://github.com/deads2k))

ensure static pods (especially those that use fixed UIDs) are restarted.  As a side effect of these changes static pods will be restarted with lower latency than before (2s vs 4s, on average) and rapid updates to pod configuration should take effect sooner.
  
  A new metric `kubelet_known_pods` has been added at ALPHA stability to report the number of pods a Kubelet is tracking in a number of internal states.  Operators may use the metrics to track an excess of pods in the orphaned state...

- Fixed the calculation of the requeue time in the cronjob controller, resulting in proper handling of failed/stuck jobs. ([#121327](https://github.com/kubernetes/kubernetes/pull/121327), [@soltysh](https://github.com/soltysh))