// for the transition into the object's current status.
  // TODO: provide exact specification for format.
  // +optional
  optional string reason = 3;

  // A human-readable description of the status of this operation.
  // TODO: decide on maximum length.
  // +optional
  optional string message = 4;

- **[alpha]** Represent node problems "not ready" and "unreachable" using `NoExecute` taints. In combination with `tolerationSeconds` described below, this allows per-pod specification of how long to remain bound to a node that becomes unreachable or not ready, rather than using the default of 5 minutes. You can enable this alpha feature by including `TaintBasedEvictions=true` in `--feature-gates`,...

### **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`
    *   Change `node.alpha.kubernetes.io/unreachable` to  `node.kubernetes.io/unreachable`

- The deprecated taints `node.alpha.kubernetes.io/notReady` and `node.alpha.kubernetes.io/unreachable` are no longer supported or adjusted. These uses should be replaced with `node.kubernetes.io/not-ready` and `node.kubernetes.io/unreachable`
 ([#73001](https://github.com/kubernetes/kubernetes/pull/73001), [@shivnagarajan](https://github.com/shivnagarajan))

  * Authorization sets `authorization.k8s.io/decision` and `authorization.k8s.io/reason` annotations with the authorization decision ("allow" or "forbid") and a human-readable description of why the decision was made (for example, RBAC includes the name of the role/binding/subject which allowed a request).

## Urgent Upgrade Notes 

### (No, really, you MUST read this before you upgrade)

- Audit log files are now created with a mode of 0600. Existing file permissions will not be changed. If you need the audit file to be readable by a non-root user, you can pre-create the file with the desired permissions. ([#95387](https://github.com/kubernetes/kubernetes/pull/95387), [@JAORMX](https://github.com/JAORMX)) [SIG API Machinery and Auth]

- Added readiness gates in extended output for pods ([#70775](https://github.com/kubernetes/kubernetes/pull/70775), [@freehan](https://github.com/freehan))
- Added `Ready` column and improve human-readable output of Deployments and StatefulSets ([#70466](https://github.com/kubernetes/kubernetes/pull/70466), [@Pingan2017](https://github.com/Pingan2017))

- Generated `ResourceClaim` names are now more readable because of an additional hyphen before the random suffix (`<pod name>-<claim name>-<random suffix>`). ([#120336](https://github.com/kubernetes/kubernetes/pull/120336), [@pohly](https://github.com/pohly))

#### Node controller
* Bug fixes:

  * Fix [transition between NotReady and Unreachable taints](https://github.com/kubernetes/kubernetes/issues/43444). ([#44042](https://github.com/kubernetes/kubernetes/pull/44042), [@gmarek](https://github.com/gmarek))


#### Node Components

* Features

- In text format, log messages that previously used quoting to prevent multi-line output (for example, text="some \"quotation\", a\nline break") will now be printed with more readable multi-line output without the escape sequences. ([#107103](https://github.com/kubernetes/kubernetes/pull/107103), [@pohly](https://github.com/pohly))