I've been combing through my AWS bills and noticed something strange - Cloudwatch bills a very small amount for every available region with a charge it lists as $0.01 per 1,000 metrics requested using GetMetricData API - Asia Pacific (Singapore)
(or insert region here).
In my main region (US East) I see billing as expected - a few bucks total for PutLogEvents and GetMetricData calls, as you'd expect from normal use.
But in every other region I also have these costs - a few cents each - for GetMetricData calls in that region. Does anybody know the source of these costs?