*   Fixed a set of minor issues with Cluster Autoscaler 1.0.1 ([#54298](https://github.com/kubernetes/kubernetes/pull/54298),[ @mwielgus](https://github.com/mwielgus))
*   HPA tolerance is now configurable by setting the `horizontal-pod-autoscaler-tolerance` flag. ([#52275](https://github.com/kubernetes/kubernetes/pull/52275),[ @mattjmcnaughton](https://github.com/mattjmcnaughton))

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

* 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))

* 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))