* Fix udp service blackhole problem when number of backends changes from 0 to non-0 ([#48524](https://github.com/kubernetes/kubernetes/pull/48524), [@freehan](https://github.com/freehan))
* hpa: Prevent scaling below MinReplicas if desiredReplicas is zero ([#48997](https://github.com/kubernetes/kubernetes/pull/48997), [@johanneswuerbach](https://github.com/johanneswuerbach))

* Do not count failed pods as unready in HPA controller ([#60648](https://github.com/kubernetes/kubernetes/pull/60648), [@bskiba](https://github.com/bskiba))

* GCI: Add two GCI specific metadata pairs ([#25105](https://github.com/kubernetes/kubernetes/pull/25105), [@andyzheng0831](https://github.com/andyzheng0831))
* Ensure status is not changed during an update of PV, PVC, HPA objects ([#24924](https://github.com/kubernetes/kubernetes/pull/24924), [@mqliang](https://github.com/mqliang))

* HorizontalPodAutoscaler is no longer supported in extensions/v1beta1 version. Use autoscaling/v1 instead. ([#35782](https://github.com/kubernetes/kubernetes/pull/35782), [@piosz](https://github.com/piosz))
* Fixes an HPA-related panic due to division-by-zero. ([#39694](https://github.com/kubernetes/kubernetes/pull/39694), [@DirectXMan12](https://github.com/DirectXMan12))

### Certificates

   ([#123492](https://github.com/kubernetes/kubernetes/pull/123492), [@carlory](https://github.com/carlory))
- Added metric name along with the utilization information when running `kubectl get hpa`. ([#122804](https://github.com/kubernetes/kubernetes/pull/122804), [@sreeram-venkitesh](https://github.com/sreeram-venkitesh))

- Client-go impersonation config can specify a UID to pass impersonated uid information through in requests. ([#104483](https://github.com/kubernetes/kubernetes/pull/104483), [@margocrawf](https://github.com/margocrawf))
- Create HPA v2 from v2beta2 with some fields changed. ([#102534](https://github.com/kubernetes/kubernetes/pull/102534), [@wangyysde](https://github.com/wangyysde)) [SIG API Machinery, Apps, Auth, Autoscaling and Testing]

* Added all kinds of resource objects' statuses in HPA description. ([#59609](https://github.com/kubernetes/kubernetes/pull/59609), [@zhangxiaoyu-zidif](https://github.com/zhangxiaoyu-zidif))

* Updates the kubernetes dashboard add-on to v1.10.1. Skipping dashboard login is no longer enabled by default. ([#72495](https://github.com/kubernetes/kubernetes/pull/72495), [@liggitt](https://github.com/liggitt))
* 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))

- Increase default value of discovery cache TTL for kubectl to 6 hours. ([#107141](https://github.com/kubernetes/kubernetes/pull/107141), [@mk46](https://github.com/mk46))
- Introduce policy to allow the HPA to consume the `external.metrics.k8s.io` API group. ([#104244](https://github.com/kubernetes/kubernetes/pull/104244), [@dgrisonnet](https://github.com/dgrisonnet))

removed from the applied configuration. Removed fields which have no other owners are deleted from the live object, or reset to their default value if they have one. Safe ownership transfers, such as the transfer of a `replicas` field from a user to an HPA without resetting to the default value are documented in [Transferring Ownership](https://kubernetes.io/docs/reference/using-api/api-concepts/#transferring-ownership) ([#92661](https://github.com/kubernetes/kubernetes/pull/92661), [@jpbetz](https:/...