#### 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

* The garbage collector now supports CustomResourceDefinitions and APIServices. ([#65918](https://github.com/kubernetes/kubernetes/pull/65918), [@nikhita](https://github.com/nikhita))

      - [GCE](#gce)
      - [GKE](#gke)
      - [vSphere](#vsphere)
    - [Federation](#federation-2)
      - [kubefed](#kubefed)
      - [Other Notable Changes](#other-notable-changes-13)
    - [Garbage Collector](#garbage-collector)
    - [kubeadm](#kubeadm-2)
    - [kubectl](#kubectl-1)
      - [New Commands](#new-commands)
      - [Create subcommands](#create-subcommands)

* fix data loss issue if using existing azure disk with partitions in disk mount  ([#63270](https://github.com/kubernetes/kubernetes/pull/63270), [@andyzhangx](https://github.com/andyzhangx))
* The garbage collector now supports CustomResourceDefinitions and APIServices. ([#65916](https://github.com/kubernetes/kubernetes/pull/65916), [@xmudrii](https://github.com/xmudrii))

* Finalizers are now honored on custom resources, and on other resources even when garbage collection is disabled via the apiserver flag `--enable-garbage-collector=false` ([#51469](https://github.com/kubernetes/kubernetes/pull/51469), [@ironcladlou](https://github.com/ironcladlou))

- Fixed a regression in default configurations, which enabled PodDisruptionConditions by default, 

- Fixed a regression in default configurations, which enabled `PodDisruptionConditions`
  by default, that prevented the control plane's pod garbage collector from deleting
  pods that contained duplicated field keys (environmental variables with repeated keys or
  container ports). ([#121103](https://github.com/kubernetes/kubernetes/pull/121103), [@mimowo](https://github.com/mimowo))

  - A cluster-scoped object with an ownerReference referencing a uid of a namespaced kind is now consistently treated as though that owner is not resolvable, and the child object is ignored by the garbage collector. ([#92743](https://github.com/kubernetes/kubernetes/pull/92743), [@liggitt](https://github.com/liggitt)) [SIG API Machinery, Apps and Testing]


## Changes by Kind

### Deprecation

- Fixed a regression in default configurations, which enabled PodDisruptionConditions by default, 

    * The `admissionregistration.k8s.io/v1beta1` versions of `MutatingWebhookConfiguration` and `ValidatingWebhookConfiguration` are deprecated and will no longer be served in v1.19.
* The garbage collector and generic object quota controller have been updated to use the metadata client which improves memory ([#78742](https://github.com/kubernetes/kubernetes/pull/78742), [@smarterclayton](https://github.com/smarterclayton))