What's the monitor or rule that trigger this specific alert?
Is it targeted to Windows COmputer class or something more specific? In the second case, maybe you can put that "something more specific" into MM instead of the whole computer.
If that's still too much, you have a couple of options left :
- Modify the monitor/rule to include a scheduler filter. That definitely require some authoring skills. Read here and here
- Create then delete an override using a powershell script and a scheduled task. Read here for the script : https://scomstuff.wordpress.com/2013/03/17/create-and-delete-monitor-overrides-with-powershell/
- Use Cookdown EasyTune Pro (paid solution) : https://cookdown.com/scom-essentials/easy-tune-pro/