[Observium] how does "ignore until" under device/alert settings work?...looking for a "in maintenance" mode for a device

Sorry if this is an obvious question but I have been playing with this and it does not behave the way I am expecting... under device properties/alerts there is an "ignore until" option as well as a "disable notifications" toggle.... [cid:image003.jpg@01D8530A.33555B80]

If I set the "ignore until" to sometime in the future and I (for example) restart the device...I still get alerted. If I toggle the "disable notifications" , I do not get the notifications anymore...however, it stays disabled past the "ignore until" time How is this feature supposed to work?

I am looking for a way to put a device in "maintenance mode" so that if I am upgrading etc...no alerts are generated and no notifications are sent.