* Resolves bottleneck in internal API server communication that can cause increased goroutines and degrade API Server performance ([#80465](https://github.com/kubernetes/kubernetes/pull/80465), [@answer1991](https://github.com/answer1991))

* Resolves bottleneck in internal API server communication that can cause increased goroutines and degrade API Server performance ([#80465](https://github.com/kubernetes/kubernetes/pull/80465), [@answer1991](https://github.com/answer1991))

following in mind:

* **JSON configuration files that contain fields with incorrect case will no longer be valid. You must correct these files before upgrading.** When specifying keys in JSON resource definitions during direct API server communication, the keys are case-sensitive. A bug introduced in Kubernetes 1.8 caused the API server to accept a request with incorrect case and coerce it to correct case, but this behaviour has been fixed in 1.11 and the API server will once again be enforcing...

`docker` service from kubeadm preflight. Docker is no longer special cased during host validation and ideally this task should be done in the now external cri-dockerd project where the importance of the compatibility matters. Use `crictl` for all communication with CRI sockets for actions like pulling images and obtaining a list of running containers instead of using the docker CLI in the case of Docker. ([#107317](https://github.com/kubernetes/kubernetes/pull/107317), [@neolit123](https://github.com/neolit123))...

*   `RunConfig` now sets device_filters to restrict how workers and PS can
    communicate. This can speed up training and ensure clean shutdowns in some
    situations. But if you have jobs that require communication between workers,
    you will have to set custom session_options in your `RunConfig`.
*   Moved Distributions and Bijectors from `tf.contrib.distributions` to

  * **WARNING:** A [known issue](https://github.com/kubernetes/kubernetes/issues/43815)
    in v1.6.0 causes `kubeadm init` to hang. Please use v1.6.1, which fixes the issue.
  * All communication is now over TLS
  * Authorization plugins can be installed by kubeadm, including the new default of RBAC
  * The bootstrap token system now allows token management and expiration

- Built Kubernetes with Go 1.22.4. ([#125363](https://github.com/kubernetes/kubernetes/pull/125363), [@cpanato](https://github.com/cpanato)) [SIG Architecture, Cloud Provider, Release, Storage and Testing]

* Introduce policy to allow the HPA to consume the metrics.k8s.io and custom.metrics.k8s.io API groups. ([#52572](https://github.com/kubernetes/kubernetes/pull/52572), [@DirectXMan12](https://github.com/DirectXMan12))
* kubelet to master communication when doing node status updates now has a timeout to prevent indefinite hangs ([#52176](https://github.com/kubernetes/kubernetes/pull/52176), [@liggitt](https://github.com/liggitt))

* Fixes a panic in kube-controller-manager cleaning up bootstrap tokens ([#82887](https://github.com/kubernetes/kubernetes/pull/82887), [@tedyu](https://github.com/tedyu))
* Resolves bottleneck in internal API server communication that can cause increased goroutines and degrade API Server performance ([#80465](https://github.com/kubernetes/kubernetes/pull/80465), [@answer1991](https://github.com/answer1991))