#### Application Deployment
* StatefulSetStatus now tracks replicas, readyReplicas, currentReplicas, and updatedReplicas. The semantics of replicas is now consistent with DaemonSet and ReplicaSet, and readyReplicas has the semantics that replicas did prior to 1.7 ([#46669](https://github.com/kubernetes/kubernetes/pull/46669), [@kow3ns](https://github.com/kow3ns)).

    * replicas, readyReplicas, currentReplicas, and updatedReplicas. The semantics of replicas is now consistent with DaemonSet and ReplicaSet, and readyReplicas has the semantics that replicas did prior to this release.

- When scaling down a ReplicaSet, delete doubled up replicas first, where a "doubled up replica" is defined as one that is on the same node as an active replica belonging to a related ReplicaSet.  ReplicaSets are considered "related" if they have a common controller (typically a Deployment). ([#80004](https://github.com/kubernetes/kubernetes/pull/80004), [...

    - [DaemonSet](#daemonset-1)
    - [Deployment](#deployment-2)
    - [Node](#node)
    - [Pod](#pod)
    - [Pod Security Policy](#pod-security-policy)
    - [RBAC](#rbac-2)
    - [ReplicaSet](#replicaset)
    - [Secrets](#secrets)
    - [Service](#service-1)
    - [StatefulSet](#statefulset-1)
    - [Taints and Tolerations](#taints-and-tolerations)
    - [Volumes](#volumes-2)

- `Statefulset` now waits for new replicas in tests when removing `.start.ordinal`. ([#119761](https://github.com/kubernetes/kubernetes/pull/119761), [@soltysh](https://github.com/soltysh))
- `ValidatingAdmissionPolicy` and `ValidatingAdmissionPolicyBinding` objects are

* Fixes bug finding master replicas in GCE when running multiple Kubernetes clusters. ([#58561](https://github.com/kubernetes/kubernetes/pull/58561), [@jesseshieh](https://github.com/jesseshieh))

 - Fixes a bug defining a default value for a replicas field in a custom resource definition that has the scale subresource enabled ([#90022](https://github.com/kubernetes/kubernetes/pull/90022), [@liggitt](https://github.com/liggitt)) [SIG API Machinery, CLI, Cloud Provider and Cluster Lifecycle]

* Respect fstype in Windows for azure disk ([#61267](https://github.com/kubernetes/kubernetes/pull/61267), [@andyzhangx](https://github.com/andyzhangx))
* Unready pods will no longer impact the number of desired replicas when using horizontal auto-scaling with external metrics or object metrics. ([#60886](https://github.com/kubernetes/kubernetes/pull/60886), [@mattjmcnaughton](https://github.com/mattjmcnaughton))

## Changes by Kind

### API Change

- Make STS available replicas optional again, ([#109241](https://github.com/kubernetes/kubernetes/pull/109241), [@ravisantoshgudimetla](https://github.com/ravisantoshgudimetla)) [SIG API Machinery and Apps]
- Make STS available replicas optional again. ([#113122](https://github.com/kubernetes/kubernetes/pull/113122), [@ashrayjain](https://github.com/ashrayjain)) [SIG Apps]

- Remove deprecated `--generator, --replicas, --service-generator, --service-overrides, --schedule` from `kubectl run`