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Same here. In fact, the AWS dashboard was still showing 2/2 checks passed for some 20 minutes after Pingdom told me my site was down.

Then the AWS dashboard finally updated and told me that 3 minutes ago my instances became unreachable. That is pretty poor. AWS should be able to know right away and email me themselves.

I've learned to ignore the checks passed for quite a while, especially for servers on load balance.

SNS sent me an e-mail of my instance alarms pretty quickly.

EDIT: My status checks were slow to update like the sibling comment stated, although the alarms that measure system resources triggered almost immediately when everything blew up. I think the status checks refresh at a certain interval, but those aren't really meant for real-time monitoring AFAIK.

By over fifteen minutes in my case. Possibly thirty. WTH.