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That's due to the general ignorance about the world outside the US.

Outside the Bay Area, really.

AWS is based in Seattle.

Sorry, Bay Area plus Seattle ;)

Actually, the post was written by someone located outside the U.S. (a place not using any US-specific time-zone), and posted to the status page by someone else located outside the U.S.

PST - Potato Standard Time, everybody knows that.

And how about they inform us what availability zone is affected instead of just writing "single availability zone" 10 times.

That is not that easy as the availability zone numbering is account-specific.

Doable, of course, but it is not just a matter of putting it into the issue description.

Amazon publishes all the underlying zone names for your account so it would be trivial for them to specify the exact availability zone.