* The `autoscaling/v2alpha1` API is now at `autoscaling/v2beta1`. However, the form of the API remains unchanged. Migrate the `HorizontalPodAutoscaler` resources to `autoscaling/v2beta1` to persist the `HorizontalPodAutoscaler` changes introduced in `autoscaling/v2alpha1`. The Horizontal Pod Autoscaler changes include support for status conditions, and autoscaling on memory and custom metrics.

### HorizontalPodAutoscaler v2 graduates to GA

Version 2 of the HorizontalPodAutoscaler API graduates to stable in the 1.23 release. The HorizontalPodAutoscaler `autoscaling/v2beta2` API is deprecated in favor of the new `autoscaling/v2` API, which the Kubernetes project recommends for all use cases.

This release does *not* deprecate the v1 HorizontalPodAutoscaler API.

- Added a new `tolerance` field to HorizontalPodAutoscaler, overriding the cluster-wide default. Enabled via the HPAConfigurableTolerance alpha feature gate. ([#130797](https://github.com/kubernetes/kubernetes/pull/130797), [@jm-franc](https://github.com/jm-franc)) [SIG API Machinery, Apps, Autoscaling,...

- Validated APIVersion fields of the `HorizontalPodAutoscaler` to ensure that API objects were created and functioned properly. ([#132537](https://github.com/kubernetes/kubernetes/pull/132537), [@lalitc375](https://github.com/lalitc375)) [SIG Etcd and Testing]

## Dependencies

- `kubectl` now uses `HorizontalPodAutoscaler` `v2` by default. ([#114886](https://github.com/kubernetes/kubernetes/pull/114886), [@a7i](https://github.com/a7i))

- Kubernetes is now built with Go 1.19.6 ([#115833](https://github.com/kubernetes/kubernetes/pull/115833), [@cpanato](https://github.com/cpanato)) [SIG Release and Testing]
- Use HorizontalPodAutoscaler v2 for kubectl ([#114886](https://github.com/kubernetes/kubernetes/pull/114886), [@a7i](https://github.com/a7i)) [SIG CLI]

### Bug or Regression

- Graduated "Forensic Container Checkpointing" (KEP #2008) from Alpha to Beta. ([#123215](https://github.com/kubernetes/kubernetes/pull/123215), [@adrianreber](https://github.com/adrianreber))
- Graduated HorizontalPodAutoscaler support for per-container metrics to stable. ([#123482](https://github.com/kubernetes/kubernetes/pull/123482), [@sanposhiho](https://github.com/sanposhiho))

- Fixes conversion error for HorizontalPodAutoscaler objects with invalid annotations ([#89968](https://github.com/kubernetes/kubernetes/pull/89968), [@liggitt](https://github.com/liggitt)) [SIG Autoscaling]