All of the cloud providers have an incentive to downplay incidents and only post them to the status page when they're really bad. The bar is pretty high to get something on there.
I mean, they outline them in their fineprint. Amazon doesn't consider the unavailability of 1 EC2 availability zone an outage because their position is that you should be architecting around that. 2 or more AZ outages in the same region and it'll show up on their status page IIRC.
