Get Beanstalk Maintenance Status

Get the group maintenance status.<ul>

<li>If the status is ACTIVE: putting the group in maintenance mode is allowed.</li> <li>If the status is AWAIT_USER_UPDATE: the group is pending for manually finishing maintenance mode.</li> <li>If the status is CANCELING_MAINTENANCE_MODE: the group is in the process of canceling maintenance mode.</li> </ul>