fields (current state), also print warnings for fields with incorrect case sensitivity - e.g. `controlPlaneEndpoint` (valid), `ControlPlaneEndpoint` (invalid). Instead of only printing warnings during `init` and `join` also print warnings when downloading the ClusterConfiguration, KubeletConfiguration or KubeProxyConfiguration objects from the cluster. This can be useful if the user has patched these objects in their respective ConfigMaps with mistakes. ([#107725](https://github.com/kubernetes/k...

- Upgraded the `PodObservedGenerationTracking` feature to beta...

## Changes by Kind

### API Change

- DRA API: The maximum number of pods that can use the same ResourceClaim is now 256 instead of 32. Downgrading a cluster where this relaxed limit is in use to Kubernetes 1.32.0 is not supported, as version 1.32.0 would refuse to update ResourceClaims with more than 32 entries in the `status.reservedFor` field. ([#129543](https://github.com/kubernetes/ku...

Some upgrade methods might upgrade etcd from 3.0 to 3.1 automatically when you upgrade from Kubernetes 1.8, unless you specify otherwise. Because [etcd does not support downgrading](https://coreos.com/etcd/docs/latest/upgrades/upgrade_3_1.html), you'll need to either remain on etcd 3.1 or restore from a backup if you want to downgrade back to Kubernetes 1.8.

## Introduction to 1.9.0

* updates kibana to 6.3.2  ([#67582](https://github.com/kubernetes/kubernetes/pull/67582), [@monotek](https://github.com/monotek))
* fixes json logging in fluentd-elasticsearch image by downgrading fluent-plugin-kubernetes_metadata_filter plugin to version 2.0.0 ([#67544](https://github.com/kubernetes/kubernetes/pull/67544), [@monotek](https://github.com/monotek))