### Instrumentation

In v1.9 we focused on improving stability of the components owned by the SIG, including Heapster, Custom Metrics API adapters for Prometheus, and Stackdriver.

### Network

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- kube-apiserver: Fixed a regression accepting patch requests > 1MB ([#84963](https://github.com/kubernetes/kubernetes/pull/84963), [@liggitt](https://github.com/liggitt))
- The example API server has renamed its `wardle.k8s.io` API group to `wardle.example.com` ([#81670](https://github.com/kubernetes/kubernetes/pull/81670), [@liggitt](https://github.com/liggitt))

* Pods that are marked for deletion and have exceeded their grace period, but are not yet deleted, no longer count toward the resource quota.([#46542](https://github.com/kubernetes/kubernetes/pull/46542))


#### Dynamic Admission Control

- When deleting objects using kubectl with the --force flag, you are no longer required to also specify --grace-period=0. ([#87776](https://github.com/kubernetes/kubernetes/pull/87776), [@brianpursley](https://github.com/brianpursley)) [SIG CLI]

- Fixed restricted debug profile. ([#117543](https://github.com/kubernetes/kubernetes/pull/117543), [@mochizuki875](https://github.com/mochizuki875))
- Fixed the `preStop` hook. This will now block the pod termination grace period. ([#115835](https://github.com/kubernetes/kubernetes/pull/115835), [@HirazawaUi](https://github.com/HirazawaUi))