Retrieves the maintenance status of the cluster.
Returns 200 OK when the maintenance status was queried successfully. Returns 307 TEMPORARY_REDIRECT redirect to the leading master when current master is not the leader. Returns 503 SERVICE_UNAVAILABLE if the leading master cannot be found. Returns an object with one list of machines per machine mode. For draining machines, this list includes the frameworks' responses to inverse offers. NOTE: Inverse offer responses are cleared if the master fails over. However, new inverse offers will be sent once the master recovers.
This endpoint requires authentication iff HTTP authentication is enabled.