Let's say an explosive glyph was set in front of a house of someone that might be attacked late in the night. Condition set that any hostile creature to the person that passes by triggers it.
So nighttime comes and sure enough a dumb assassin who doesn't check for magic or anything stumbles onto the glyph.
If I was the one who created the glyph, and I was across the town, would I know it was triggered?
I know there is the option of storing a spell like Sending in a glyph and having it communicate that way. But I was thinking that use to be more of sending someone within town a message if the trigger happens while we're far out adventuring.