Send daily warning about full disk

We have the problem that warnings about full disks are only sent once. If we miss this mail, then we are out of luck. Therefore, this warning should be sent daily until the problem is solved.

An alternative solution would be to have a multi-server dashboard with the most important parameters available. We could open this once a day and would see problems with full disks immediately. Or a multi-server dashboard where only parameters that have been exceeded are displayed.