#### 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)

- Fixed a bug that caused duplicate validation when updating a ReplicaSet. ([#131873](https://github.com/kubernetes/kubernetes/pull/131873), [@gavinkflam](https://github.com/gavinkflam)) [SIG Apps]

- `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

- The minimum value validation of ReplicationController's `replicas` and `minReadySeconds` fields have been migrated to declarative validation. The requiredness of both fields is also declaratively validated.

- When describing deployments, `OldReplicaSets` now always shows all replicasets controlled the deployment, not just those that still have replicas available. ([#113083](https://github.com/kubernetes/kubernetes/pull/113083), [@llorllale](https://github.com/llorllale)) [SIG CLI]

 - 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]

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