Well, I think it’s about time Gmail also makes up its own version of a fail whale (like on Twitter). Yes, you got it right! It’s down, yet again!
Looks like more of a Google Contacts issue because Gmail users started getting this message a while ago: Gmail is temporarily unable to access your Contacts. You may experience issues while this persists.
It’s not a usual sight that you see Gmail down and giving a 502 (temporary) error. But what if it does for unknown reasons and that also when you replying to an urgent email?
Google OS blog have come u with an interesting list of URLs from where you can access Gmail when it’s down. One of them might just work during outages at the Gmail datacenters.