Work › storage › drives. One drive, this machine only.
Open the machine, then work › storage. Drives lists every drive from the last heartbeat. files01's /mnt/backup is 97% full because the backup software keeps it that way.
Press ignore on that drive. It shows ignored and greys out. An open disk alert for it closes. Press watch again to undo.
A disk that should alert again once it passes a higher mark is Accept a known condition.