- Simplied validation error message for invalid fields by removing redundant field name. ([#132513](https://github.com/kubernetes/kubernetes/pull/132513), [@xiaoweim](https://github.com/xiaoweim)) [SIG API Machinery, Apps, Auth, Node and Scheduling]

- kubeadm: Multiple API server endpoints support upon join is removed as it is now redundant. ([#69812](https://github.com/kubernetes/kubernetes/pull/69812), [@rosti](https://github.com/rosti))

- The `kubectl patch` command no longer exits with exit code 1 when a redundant patch results in a no-op ([#66725](https://github.com/kubernetes/kubernetes/pull/66725), [@juanvallejo](https://github.com/juanvallejo))

* Removed some redundant rules created by the iptables proxier to improve performance on systems with very many services. ([#57461](https://github.com/kubernetes/kubernetes/pull/57461), [@danwinship](https://github.com/danwinship))

- Kube-proxy now supports DualStack feature with EndpointSlices and IPVS. ([#85246](https://github.com/kubernetes/kubernetes/pull/85246), [@robscott](https://github.com/robscott))
- Remove redundant API validation when using Service Topology with externalTrafficPolicy=Local ([#85346](https://github.com/kubernetes/kubernetes/pull/85346), [@andrewsykim](https://github.com/andrewsykim))

- Added a redundant process to remove tracking finalizers from Pods that belong to Jobs. The process kicks in after the control plane marks a Job as finished. ([#119944](https://github.com/kubernetes/kubernetes/pull/119944), [@Sharpz7](https://github.com/Sharpz7))

- Kubeadm: fixed a bug during kubeadm upgrade, where it is not possible to mount a new device and create a symbolic link for /etc/kubernetes...

  - Fix an error where existing nodes were not considered as destinations while finding place for pods in scale-down simulations
  - Remove redundant log lines and reduce severity around parsing kubeEnv
  - Don't treat nodes created by virtual kubelet as nodes from non-autoscaled node groups
  - Remove redundant logging around calculating node utilization
  - Add configurable `--network` and `--rm` flags for docker in `Makefile`

- Introduced new metrics removing the redundant subsystem in kube-apiserver pod logs metrics and deprecate the original ones:
  - kube_apiserver_pod_logs_pods_logs_backend_tls_failure_total becomes kube_apiserver_pod_logs_backend_tls_failure_total

  - Fix an error where existing nodes were not considered as destinations while finding place for pods in scale-down simulations
  - Remove redundant log lines and reduce severity around parsing kubeEnv
  - Don't treat nodes created by virtual kubelet as nodes from non-autoscaled node groups
  - Remove redundant logging around calculating node utilization
  - Add configurable `--network` and `--rm` flags for docker in `Makefile`