Maintenance Mode with levels
Add diffrent Level of MaintenanceMode, Some time you wan't to set a server or application, into maintenance "Hard", Today, when you have setup a Mantenance for exampel over the weekend, and if something/one other person is activate a new maintenance for a group that the servers belong, the last set or maintenance time is set.
And the servers/app that should be in maintenancemode for the weekend, is in maintenance for less time.
So if possible add Maintenance level like SOFT | HARD . where SOFT is possible to override, but not HARD state.
The "longest" mode should win.