Maintenance Mode/Scheduled Maintenance

[tcatlas]

Is your feature request related to a problem? Please describe.
I use an external service to restart some of my game servers, however this leads to erroneous error messages when Discord alerting is set up.

Describe the solution you'd like
Add a "maintenance mode" manual toggle to disable alerting while it is on, as well as a way to set a recurring scheduled maintenance mode (my server restarts automatically each day at 6 AM, but only when it meets certain criteria).

Describe alternatives you've considered

• Disabling alerting altogether, which is obviously a poor workaround
• Ignoring the alerts each and every morning, which is obnoxious.

Additional context
n/a