- `kubelet_pleg_relist_interval_microseconds` -> `kubelet_pleg_relist_interval_seconds`
      - `kubelet_eviction_stats_age_microseconds` -> `kubelet_eviction_stats_age_seconds`
      - `kubelet_runtime_operations` -> `kubelet_runtime_operations_total`
      - `kubelet_runtime_operations_latency_microseconds` -> `kubelet_runtime_operations_duration_seconds`

Please see the [Releases Page](https://github.com/kubernetes/kubernetes/releases) for older releases.

Release notes of older releases can be found in:
- [CHANGELOG-1.2.md](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.2.md)

- Kubelet: Added kubelet serving certificate metric `server_rotation_seconds` which is a histogram reporting the age of a just rotated serving certificate in seconds. ([#84534](https://github.com/kubernetes/kubernetes/pull/84534), [@sambdavidson](https://github.com/sambdavidson))

- Hugepages request values are limited to integer multiples of the page size. ([#98515](https://github.com/kubernetes/kubernetes/pull/98515), [@lala123912](https://github.com/lala123912)) [SIG Apps]

* Allow attach of volumes to multiple nodes for vSphere ([#51066](https://github.com/kubernetes/kubernetes/pull/51066), [@BaluDontu](https://github.com/BaluDontu))


Please see the [Releases Page](https://github.com/kubernetes/kubernetes/releases) for older releases.

Release notes of older releases can be found in:
- [CHANGELOG-1.2.md](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.2.md)

the memory capacity for a container, and uses `oom_scores` to recommend an order for killing container processes if an out-of-memory event occurs. This implementation has shortcomings: for `Guaranteed` pods, memory can not be fully reserved, and the page cache is at risk of being recycled. For `Burstable` pods, overcommitting memory (setting `request` less than `limit` ) could increase the risk of a container being killed when the Linux kernel detects an out of memory condition.

As an...

    * PodOverhead is an alpha feature as of Kubernetes 1.16.
* Fix kubelet errors in AArch64 with huge page sizes smaller than 1MiB ([#78495](https://github.com/kubernetes/kubernetes/pull/78495), [@odinuge](https://github.com/odinuge))

The Kubernetes community [has written a blog post about this in detail](https://blog.k8s.io/2020/12/02/dont-panic-kubernetes-and-docker/) with [a dedicated FAQ page for it](https://blog.k8s.io/2020/12/02/dockershim-faq/).

### External credential provider for client-go

### Moved container registry service from k8s.gcr.io to registry.k8s.io

[Moving container registry from k8s.gcr.io to registry.k8s.io](https://github.com/kubernetes/kubernetes/pull/109938) got merged. For more details, see the [wiki page](https://github.com/kubernetes/k8s.io/wiki/New-Registry-url-for-Kubernetes-\(registry.k8s.io\)), [announcement](https://groups.google.com/a/kubernetes.io/g/dev/c/DYZYNQ_A6_c/m/oD9_Q8Q9AAAJ) was sent to the kubernetes development mailing list.

- Change `kubectl diff --invalid-arg` status code from 1 to 2 to match docs ([#105445](https://github.com/kubernetes/kubernetes/pull/105445), [@ardaguclu](https://github.com/ardaguclu))
- Changed kubectl describe to compute age of an event using the `EventSeries.count` and `EventSeries.lastObservedTime`. ([#104482](https://github.com/kubernetes/kubernetes/pull/104482), [@harjas27](https://github.com/harjas27))