Yea, it happens from time to time.
Usually at the worst possible moment.
The problem in this case is that the server monitor reads this:
0, 12/25/2009, 12:25 AM, SUCCESS, 21375, SLOW
So the servers are technically up but taking 21 seconds to respond.
The monitor should (imo) but doesn't have a short enough cut off time.
So because it thinks it's up, no pagers get rung.
I've put in calls. Should be up soon.