- client-go
  - The deprecated versionless API group accessors (like `clientset.Apps()`) have been removed. Use an explicit version instead (like `clientset.AppsV1()`) ([#74422](https://github.com/kubernetes/kubernetes/pull/74422), [@liggitt](https://github.com/liggitt))

- Apiserver will now reject connection attempts to `0.0.0.0/::` when handling a proxy subresource request. ([#107402](https://github.com/kubernetes/kubernetes/pull/107402), [@anguslees](https://github.com/anguslees))
- Bug: client-go clientset was not defaulting to the user agent, and was using the default golang agent for all the requests. ([#108772](https://github.com/kubernetes/kubernetes/pull/108772), [@aojea](https://github.com/aojea))

- Signatures on generated clientset methods have been modified to accept `context.Context` as a first argument. Signatures of generated Create, Update, and Patch methods have been updated to accept CreateOptions, UpdateOptions and PatchOptions respectively. Clientsets that with the...

### Bug or Regression

- Bug: client-go clientset was not defaulting the user agent, using the default golang agent for all the requests. ([#108791](https://github.com/kubernetes/kubernetes/pull/108791), [@aojea](https://github.com/aojea)) [SIG API Machinery and Instrumentation]