/** The key of the configuration. e.g. [a-zA-Z0-9_]+ */
    String USER_CODE_PATTERN = "user.code.pattern";

    /** The key of the configuration. e.g. Administrator */
    String MAIL_FROM_NAME = "mail.from.name";

    /** The key of the configuration. e.g. root@localhost */
    String MAIL_FROM_ADDRESS = "mail.from.address";

* kubeadm: fixed storing of front-proxy certificate in secrets required by kube-controller-manager selfhosting pivoting ([#72727](https://github.com/kubernetes/kubernetes/pull/72727), [@bart0sh](https://github.com/bart0sh))
* Administrator is able to configure max pids for a pod on a node. ([#72076](https://github.com/kubernetes/kubernetes/pull/72076), [@derekwaynecarr](https://github.com/derekwaynecarr))

### Kubernetes Node system swap support