claaarky - 4:50 pm on Sep 21, 2012 (gmt 0)

I don't think you can see real time mobile traffic stats in GA though, only the total for the day so far or for a specific day (as far as I can see).

If your dead period happens for 4 hours in the middle of the day and that's down to a sudden surge of mobile users I can't think how you'd nail that down in GA.