#### Garbage Collector
* The garbage collector now supports custom APIs added via Custom Resource Definitions
  or aggregated API servers. The garbage collector controller refreshes periodically.
  Therefore, expect a latency of about 30 seconds between when an API is added and when
  the garbage collector starts to manage it.


#### Monitoring/Prometheus

## Changes since v1.1.1

### Major Themes

  * <strong>Significant scale improvements</strong>. Increased cluster scale by 400% to 1000 nodes with 30,000 pods per cluster.
Kubelet supports 100 pods per node with 4x reduced system overhead.
  * <strong>Simplified application deployment and management. </strong>

- 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))

  - `PriorityLevelConfiguration`: the `.spec.limited.nominalConcurrencyShares` field defaults to `30` only if the field is omitted (v1beta3 also defaulted an explicit `0` value to `30`). Specifying an explicit `0` value is not allowed in the `v1` version in v1.29 to ensure compatibility with `v1.28` API servers. In `v1.30`, explicit `0` values will be allowed in this field in the `v1` API....

- Specific error message on failed rolling update issued by older kubectl against 1.4 master ([#32751](https://github.com/kubernetes/kubernetes/issues/32751))
- bump master cidr range from /30 to /29 ([#32886](https://github.com/kubernetes/kubernetes/issues/32886))
- non-hostNetwork daemonsets will almost always have a pod that fails to schedule ([#32900](https://github.com/kubernetes/kubernetes/issues/32900))

- Add a configuration field to shorten the timeout of validating/mutating admission webhook call. The timeout value must be between 1 and 30 seconds. Default to 30 seconds when unspecified.  ([#74562](https://github.com/kubernetes/kubernetes/pull/74562), [@roycaihw](https://github.com/roycaihw))

* Re-add /healthz/ping handler in genericapiserver ([#38603](https://github.com/kubernetes/kubernetes/pull/38603), [@sttts](https://github.com/sttts))
* Fail kubelet if runtime is unresponsive for 30 seconds ([#38527](https://github.com/kubernetes/kubernetes/pull/38527), [@derekwaynecarr](https://github.com/derekwaynecarr))

- Deprecate `apiserver_longrunning_gauge`...

  - the `scheduler.al...