* Note that because any taints you might have created with Kubernetes 1.5 can only affect the scheduling of new pods (the `NoExecute` taint effect is introduced in 1.6), neither the master upgrade nor your running `kubectl taint` to re-create the taints will affect pods that are already running.

### **Scheduling**

*   Taint key `unreachable` is now in GA.
*   Taint key `notReady` is changed to `not-ready`, and is also now in GA.
*   These changes are automatically updated for taints. Tolerations for these taints must be updated manually. Specifically, you must:
    *   Change `node.alpha.kubernetes.io/notReady` to `node.kubernetes.io/not-ready`

- Kubeadm: only taint control plane nodes when the legacy "master" taint is present. This avoids the bug where "kubeadm upgrade" will re-taint a control plane  node with the new "control plane" taint even if the user explicitly untainted the node. ([#109840](https://github.com/kubernetes/kubernetes/pull/109840), [@neolit123](https://github.com/neolit123))

### SIG OpenStack

- Openstack now supports the node shutdown taint. The taint is added when an instance is shutdown in openstack. ([#67982](https://github.com/kubernetes/kubernetes/pull/67982), [@zetaab](https://github.com/zetaab))

### SIG Scheduling

([#47977](https://github.com/kubernetes/kubernetes/pull/47977), [#44957](https://github.com/kubernetes/kubernetes/pull/44957))

- Kubeadm: only taint control plane nodes when the legacy "master" taint is present. This avoids a bug where "kubeadm upgrade" will re-taint a control plane node with the new "control plane" taint even if the user explicitly untainted the node. ([#109841](https://github.com/kubernetes/kubernetes/pull/109841), [@neolit123](https://github.com/neolit123)) [SIG...

- Fixing a bug where a failed node may not have the NoExecute taint set correctly ([#98943](https://github.com/kubernetes/kubernetes/pull/98943), [@CKchen0726](https://github.com/CKchen0726)) [SIG Apps and Node]

  - The taint applied to control-plane nodes "node-role.kubernetes.io/master:NoSchedule" is now deprecated and will be removed in a future release after a GA deprecation period.
  - Apply toleration for a new, future taint "node-role.kubernetes.io/control-plane:NoSchedule" to the kubeadm CoreDNS / kube-dns managed manifests. Note that this taint is not yet applied to kubeadm control-plane nodes.

- Updated json representation for a conflicted taint to `Key=Effect` when a conflicted taint occurs in kubectl taint. ([#104011](https://github.com/kubernetes/kubernetes/pull/104011), [@manugupt1](https://github.com/manugupt1))
- Upgrades functionality of `kubectl kustomize` as described at

* Only set sysctls for infra containers ([#32383](https://github.com/kubernetes/kubernetes/pull/32383), [@sttts](https://github.com/sttts))
* fix kubectl taint e2e flake: add retries for removing taint ([#33872](https://github.com/kubernetes/kubernetes/pull/33872), [@kevin-wangzefeng](https://github.com/kevin-wangzefeng))