Before updating to 1.9, you are strongly recommended to back up your etcd data. Consult the installation procedure you are using (kargo, kops, kube-up, kube-aws, kubeadm etc) for specific advice.

- CEL authorizer checks no longer raise runtime errors. Calls to "check" will always return a decision object and the authorization error (if any) can be accessed within expressions using the new decision methods "errored" and "error". ([#118804](https://github.com/kubernetes/kubernetes/pull/118804), [@benluddy](https://github.com/benluddy)) [SIG API Machinery]

### Other notable changes

* Support --all-namespaces in kubectl describe ([#26315](https://github.com/kubernetes/kubernetes/pull/26315), [@dims](https://github.com/dims))
* Add checks in Create and Update Cgroup methods ([#28566](https://github.com/kubernetes/kubernetes/pull/28566), [@dubstack](https://github.com/dubstack))

    String API_CORS_ALLOW_ORIGIN = "api.cors.allow.origin";

    /** The key of the configuration. e.g. GET, POST, OPTIONS, DELETE, PUT */
    String API_CORS_ALLOW_METHODS = "api.cors.allow.methods";

    /** The key of the configuration. e.g. 3600 */
    String API_CORS_MAX_AGE = "api.cors.max.age";

    /** The key of the configuration. e.g. Origin, Content-Type, Accept, Authorization, X-Requested-With */

pkg go/build/constraint, type Expr interface, Eval(func(string) bool) bool
pkg go/build/constraint, type Expr interface, String() string
pkg go/build/constraint, type Expr interface, unexported methods
pkg go/build/constraint, type NotExpr struct
pkg go/build/constraint, type NotExpr struct, X Expr
pkg go/build/constraint, type OrExpr struct
pkg go/build/constraint, type OrExpr struct, X Expr

pkg go/ast, type Spec interface, unexported methods
pkg go/ast, type StarExpr struct
pkg go/ast, type StarExpr struct, Star token.Pos
pkg go/ast, type StarExpr struct, X Expr
pkg go/ast, type Stmt interface, End() token.Pos
pkg go/ast, type Stmt interface, Pos() token.Pos
pkg go/ast, type Stmt interface, unexported methods
pkg go/ast, type StructType struct

* Fixes [#49418](https://github.com/kubernetes/kubernetes/pull/49418) where kube-controller-manager can panic on volume.CanSupport methods and enter a crash loop. ([#49420](https://github.com/kubernetes/kubernetes/pull/49420), [@gnufied](https://github.com/gnufied))

- Added name validation for dynamic client methods in client-go ([#75072](https://github.com/kubernetes/kubernetes/pull/75072), [@lblackstone](https://github.com/lblackstone))

checks for `err == ErrWaitTimeout`, or compare specifically to context errors as needed. A future release will make the `ErrWaitTimeout` error private and callers must use `Interrupted()` instead. If you are returning `ErrWaitTimeout` from your own methods, switch to creating a location specific `cause err` and pass it to the new method `wait.ErrorInterrupted(cause) error` which will ensure `Interrupted()` returns true for your loop. 
  
  The `wait.NewExponentialBackoffManager` and `wa...

.emulateTransitionEnd(backdropTransitionDuration)\n      } else {\n        callbackRemove()\n      }\n    } else if (callback) {\n      callback()\n    }\n  }\n\n  // ----------------------------------------------------------------------\n  // the following methods are used to handle overflowing modals\n  // todo (fat): these should probably be refactored out of modal.js\n  // ----------------------------------------------------------------------\n\n  _adjustDialog() {\n    const isModalOverflowing = this._...