- Kubelets perform fewer unnecessary pod status update operations on the API server. ([#88591](https://github.com/kubernetes/kubernetes/pull/88591), [@smarterclayton](https://github.com/smarterclayton)) [SIG Node and Scalability]

- The scheduler now scores fewer than all nodes in every scheduling cycle. This can improve performance of the scheduler in large clusters. ([#66733](https://github.com/kubernetes/kubernetes/pull/66733), [@bsalamat](https://github.com/bsalamat)) Courtesy of SIG Scheduling

- External facing API podresources is now available under k8s.io/kubelet/pkg/apis/ ([#92632](https://github.com/kubernetes/kubernetes/pull/92632), [@RenaudWasTaken](https://github.com/RenaudWasTaken)) [SIG Node and Testing]
- Fewer candidates are enumerated for preemption to improve performance in large clusters. ([#94814](https://github.com/kubernetes/kubernetes/pull/94814), [@adtac](https://github.com/adtac))

- Updated creation of `LoadBalancer` services, for there to be fewer AWS security group rules in most cases. ([#112267](https://github.com/kubernetes/kubernetes/pull/112267), [@sjenning](https://github.com/sjenning))

p2 := new([]int)  // p2 points to an uninitialized slice with value nil and length 0
</pre>

<p>
The length of an array literal is the length specified in the literal type.
If fewer elements than the length are provided in the literal, the missing
elements are set to the zero value for the array element type.
It is an error to provide elements with index values outside the index range

  
  kubeadm: Started using `k8s.io/system-validators` `v1.12.1` in `kubeadm` `v1.35`. During `kubeadm init`, `kubeadm join`, and `kubeadm upgrade`, the SystemVerification preflight check throws an error if cgroups v1 is detected and the detected `kubelet` version is `v1.35` or newer. For older versions of `kubelet`, a preflight warning is displayed.
  

- kubeadm commands now print warnings if input YAML documents contain unknown or duplicate fields.
- kubeadm now properly recognizes Docker 18.09.0 and newer, but still treats 18.06 as the default supported version.
- kubeadm now automatically sets the `--pod-infra-container-image` flag when starting the kubelet.

### SIG IBM Cloud

Other notable changes include:
* CoreDNS replaces kube-dns as the default DNS provider

### Bug or Regression

- Kubeadm: fixed bug where v1beta3's ClusterConfiguration.APIServer.TimeoutForControlPlane is not respected in newer versions of kubeadm where v1beta4 is the default. ([#133755](https://github.com/kubernetes/kubernetes/pull/133755), [@HirazawaUi](https://github.com/HirazawaUi)) [SIG Cluster Lifecycle]

### Other (Cleanup or Flake)

## Deprecations and Removals
- `kubeadm.k8s.io/v1beta1` has been deprecated, you should update your config to use newer non-deprecated API versions. ([#83276](https://github.com/kubernetes/kubernetes/pull/83276), [@Klaven](https://github.com/Klaven))