passed a file which contains RBAC roles, rolebindings, clusterroles, or
  clusterrolebindings, this command computes covers and adds the missing rules.
  The logic required to properly apply RBAC permissions is more complicated
  than a JSON merge because you have to compute logical covers operations between
  rule sets. This means that we cannot use `kubectl apply` to update RBAC roles

* RBAC PolicyRules now allow resource=`*/<subresource>` to cover `any-resource/<subresource>`.   For example, `*/scale` covers `replicationcontroller/scale`. ([#53722](https://github.com/kubernetes/kubernetes/pull/53722), [@deads2k](https://github.com/deads2k))

### Other (Cleanup or Flake)

- A new storage E2E testsuite covers CSIStorageCapacity publishing if a driver opts into the test. ([#100537](https://github.com/kubernetes/kubernetes/pull/100537), [@pohly](https://github.com/pohly)) [SIG Storage and Testing]

### Feature

- 'Added selector validation to `HorizontalPodAutoscaler`: when multiple HPAs
  select the same set of Pods, scaling now will be disabled for those HPAs with
  the reason `AmbiguousSelector`. This change also covers a case when multiple HPAs
  point to the same deployment.'
   ([#112011](https://github.com/kubernetes/kubernetes/pull/112011), [@pbeschetnov](https://github.com/pbeschetnov))

* Ensures the conformance test image saves results before exiting when ginkgo returns non-zero value. ([#76039](https://github.com/kubernetes/kubernetes/pull/76039), [@johnSchnake](https://github.com/johnSchnake))

* Improve status messages ([#40691](https://github.com/kubernetes/kubernetes/pull/40691), [@Cynerva](https://github.com/Cynerva))
* Splits Juju Charm layers into master/worker roles ([#40324](https://github.com/kubernetes/kubernetes/pull/40324), [@chuckbutler](https://github.com/chuckbutler))
    * Adds support for 1.5.x series of Kubernetes

* StatefulSet controllers no longer force a resync every 30 seconds when nothing has changed. ([#75622](https://github.com/kubernetes/kubernetes/pull/75622), [@jonsabo](https://github.com/jonsabo))
* Ensures the conformance test image saves results before exiting when ginkgo returns non-zero value. ([#76039](https://github.com/kubernetes/kubernetes/pull/76039), [@johnSchnake](https://github.com/johnSchnake))

component-base/logs: that package no longer adds flags to the global flag sets. Commands which want the klog and `--log-flush-frequency` flags must explicitly call `logs.AddFlags`; the new `cli.Run` does that for commands. That helper function also covers flag normalization and printing of usage and errors in a consistent way (print usage text first if parsing failed, then the error). ([#105076](https://github.com/kubernetes/kubernetes/pull/105076), [@pohly](https://github.com/pohly))

###...

- Improve error messages related to nodePort endpoint changes conntrack entries cleanup. ([#96251](https://github.com/kubernetes/kubernetes/pull/96251), [@ravens](https://github.com/ravens)) [SIG Network]
- In dual-stack clusters, kubelet will now set up both IPv4 and IPv6 iptables rules, which may

SIG Network has graduated the widely used [Ingress API](https://kubernetes.io/docs/concepts/services-networking/ingress/) to general availability in Kubernetes 1.19. This change recognises years of hard work by Kubernetes contributors, and paves the way for further work on future networking APIs in Kubernetes.

### seccomp graduates to General Availability