* Fixes a bug in HPA controller so HPAs are always updated every resyncPeriod (15 seconds). ([#72373](https://github.com/kubernetes/kubernetes/pull/72373), [@krzysztof-jastrzebski](https://github.com/krzysztof-jastrzebski))

- Kubernetes will try to acquire the iptables lock every 100 msec during 5 seconds instead of every second. This is especially useful for environments using kube-proxy in iptables mode with a high churn rate of services. ([#85771](https://github.com/kubernetes/kubernetes/pull/85771), [@aojea](https://github.com/aojea)) [SIG...

* Adds the `Categories []string` field to API resources, which represents the list of group aliases (e.g. "all") that every resource belongs to.  ([#43338](https://github.com/kubernetes/kubernetes/pull/43338), [@fabianofranz](https://github.com/fabianofranz))

- Fix: The volume is not detached after the pod and PVC objects are deleted. ([#116138](https://g...

.envrc

# Downloaded kubernetes binary release tar ball
kubernetes.tar.gz

# Phony test files used as part of coverage generation
zz_generated_*_test.go

# Just in time generated data in the source, should never be committed
/test/e2e/generated/bindata.go

# This file used by some vendor repos (e.g. github.com/go-openapi/...) to store secret variables and should not be ignored
!\.drone\.sec

/bazel-*
*.pyc

- Fixed kubelet startup getting stuck with `NewVolumeManagerReconstruction` feature enabled and a...

Variables that were part of kube-env that were only used for kubelet flags are no longer being set, and are being replaced by the more portable mechanism of the kubelet configuration file. The individual variables in the kube-env metadata entry were never meant to be a stable interface and this release note only applies if you are depending on them. ([#60020](https://github.com/kubernetes/kubernetes/pull/60020), [@roberthbailey](https://github.com/roberthbailey))

* kube-proxy: feature gates...

- Renames the timeout field for the DelegatingAuthenticationOptions to TokenRequestTimeout and set the timeout only for the token review client. Previously the timeout was also applied to watches making them reconnecting every 10 seconds. ([#101102](https://github.com/kubernetes/kubernetes/pull/101102), [@p0lyn0mial](https://github.com/p0lyn0mial)) [SIG API Machinery, Auth and Cloud Provider]

* Advanced audit allows logging failed login attempts ([#51119](https://github.com/kubernetes/kubernetes/pull/51119), [@soltysh](https://github.com/soltysh))
* kubeadm: Add support for using an external CA whose key is never stored in the cluster ([#50832](https://github.com/kubernetes/kubernetes/pull/50832), [@nckturner](https://github.com/nckturner))

  - `priority_level_seat_count_watermarks` is removed.
  - `priority_level_request_count_samples` is replaced with `priority_level_request_utilization`, which samples every nanosecond rather than every millisecond; the old metric conveyed utilization despite its name.