- ReplicaSets of paused Deployments are now scaled while the Deployment is paused. This is retroactive to existing Deployments.
- When scaling a Deployment during a rollout, the ReplicaSets of all Deployments are now scaled proportionally based on the number of replicas they each have instead of only scaling the newest ReplicaSet.

### kubectl rolling-update: < v1.4.0 client vs >=v1.4.0 cluster

### Bug or Regression

- Fixes CSI volume attachment scaling issue by using informers. ([#91307](https://github.com/kubernetes/kubernetes/pull/91307), [@yuga711](https://github.com/yuga711)) [SIG API Machinery, Apps, Node, Storage and Testing]

- Azure virtual machine scale sets (VMSS) allow you to create and manage identical load balanced VMs that automatically increase or decrease based on demand or a set schedule.
- With this new stable feature, Kubernetes supports the scaling of containerized applications with Azure VMSS, including the ability to integrate it with cluster-autoscaler to automatically adjust the size of the Kubernetes clusters based on the same conditions.

### SIG-cli

- Added support for in-place vertical scaling of Pods with sidecars (containers defined within `initContainers` where the `restartPolicy` is set to `Always`). ([#128367](https://github.com/kubernetes/kubernetes/pull/128367), [@vivzbansal](https://github.com/vivzbansal)) [SIG API Machinery, Apps,...

* Fixed error where config map for Metadata Agent was not created by addon manager. ([#62909](https://github.com/kubernetes/kubernetes/pull/62909), [@kawych](https://github.com/kawych))
* Fixed permissions to allow statefulset scaling for admins, editors, and viewers ([#62336](https://github.com/kubernetes/kubernetes/pull/62336), [@deads2k](https://github.com/deads2k))

* CRI: respect container's stopping timeout. ([#44998](https://github.com/kubernetes/kubernetes/pull/44998), [@feiskyer](https://github.com/feiskyer))
* Fix problems with scaling up the cluster when unschedulable pods have some persistent volume claims. ([#44860](https://github.com/kubernetes/kubernetes/pull/44860), [@mwielgus](https://github.com/mwielgus))

  - Include taints by condition when determining if a node is unready/still starting
  - Fix `update-vendor.sh` to work on OSX and zsh
  - Add best-effort eviction for DaemonSet pods while scaling down non-empty nodes
  - Add build support for ARM64
  
  ### AliCloud
  - Add missing daemonsets and replicasets to ALI example cluster role
  
  ### Apache CloudStack

- Added CEL expressions to `v1alpha1 AuthenticationConfiguration`. ([#121078](https://github.com/kubernetes/kubernetes/pull/121078), [@aramase](https://github.com/aramase))
- Added Windows support for InPlace Pod Vertical Scaling feature. ([#112599](https://github.com/kubernetes/kubernetes/pull/112599), [@fabi200123](https://github.com/fabi200123)) [SIG Autoscaling, Node, Scalability, Scheduling and Windows]

- Fixed issue in `Winkernel` Proxier - Unexpected active TCP connection drops while horizontally scaling the endpoints for a LoadBalancer Service with Internal Traffic Policy: `Local` ([#113742](https://github.com/kubernetes/kubernetes/pull/113742), [@princepereira](https://github.com/princepereira))

- Extend discovery GroupManager with Group lister interface ([#127524](https://github.com/kubernetes/kubernetes/pull/127524), [@mjudeikis](https://github.com/mjudeikis)) [SIG API Machinery]
- Fixed: Avoid overwriting in-pod vertical scaling updates on systemd daemon reloads when using systemd ([#124216](https://github.com/kubernetes/kubernetes/pull/124216), [@iholder101](https://github.com/iholder101)) [SIG Node]