Does Alarm caster know if alarm has been triggered by multiple creatures at the same time?


Scenario:

I know that Alarm has been cast on an area.

I become invisible and wait for another creature to approach the affected area.

At the exact moment this creature enters the affected area, I also enter (still invisible).

Would the caster of Alarm know that the Alarm had been triggered by two creatures, or would they only be aware that the Alarm had been triggered generally?