* Kubernetes 1.12 also enables [Kubelet device plugin registration](https://github.com/kubernetes/enhancements/issues/595) feature by default. Before upgrading to 1.12, ensure the `driver-registrar` CSI sidecar container for your...

- TaintNodesByCondition was graduated to GA, CheckNodeMemoryPressure, CheckNodePIDPressure, CheckNodeDiskPressure, CheckNodeCondition were accidentally removed since 1.12, the replacement is to use CheckNodeUnschedulablePred ([#84152](https://github.com/kubernetes/kubernetes/pull/84152), [@draveness](https://github.com/draveness))

- AdvancedAuditing feature gate that graduated to GA in 1.12 and was unconditionally enabled has been removed in v1.28. ([#118763](https://github.com/kubernetes/kubernetes/pull/118763), [@Shubham82](https://github.com/Shubham82)) [SIG API Machinery and Auth]

* The kubelet's cadvisor port has been deprecated. The default will change to 0 (disabled) in 1.12, and the cadvisor port will be removed entirely in 1.13. ([#59827](https://github.com/kubernetes/kubernetes/pull/59827), [@dashpole](https://github.com/dashpole))

- Es-image remains unchanged at Elasticsearch 6.3.2 since Kubernetes 1.12 ([#67484](https://github.com/kubernetes/kubernetes/pull/67484))
- metrics-server remains unchanged at v0.3.1 since Kubernetes 1.12 ([#68746](https://github.com/kubernetes/kubernetes/pull/68746))
- GLBC remains unchanged at v1.2.3 since Kubernetes 1.12 ([#66793](https://github.com/kubernetes/kubernetes/pull/66793))

* There's a known issue where the Vertical Pod Autoscaler will radically change implementation in 1.12, so users of VPA (alpha) in 1.11 are warned that they will not be able to automatically migrate their VPA configs from 1.11 to 1.12.


## Before Upgrading

- GLBC remains unchanged at v1.2.3 since Kubernetes 1.12 ([#66793](https://github.com/kubernetes/kubernetes/pull/66793))
- Ingress-gce remains unchanged at v1.2.3 since Kubernetes 1.12 ([#66793](https://github.com/kubernetes/kubernetes/pull/66793))

* Remove the --cloud-provider flag for beta init UX ([#41710](https://github.com/kubernetes/kubernetes/pull/41710), [@luxas](https://github.com/luxas))
* Fixed an SELinux issue in kubeadm on Docker 1.12+ by moving etcd SELinux options from container to pod. ([#40682](https://github.com/kubernetes/kubernetes/pull/40682), [@dgoodwin](https://github.com/dgoodwin))

  - The `--export` flag for the `kubectl get` command, deprecated since v1.14, will be removed in v1.18.
  - The `--pod`/`-p` flag for `kubectl exec`, deprecated since 1.12, has been removed.
  - `kubectl scale job`, deprecated since 1.10, has been removed. ([#78445](https://github.com/kubernetes/kubernetes/pull/78445), [@soltysh](https://github.com/soltysh))


- kubelet

- Kube-controller-manager: the `--horizontal-pod-autoscaler-use-rest-clients` flag and Heapster support in the horizontal pod autoscaler, deprecated since 1.12, is removed. ([#90368](https://github.com/kubernetes/kubernetes/pull/90368), [@serathius](https://github.com/serathius))