Comment by david_shaw

Yes, it's the least reliable. Thanks for summarizing the data here to illustrate the issue.

It's often seen as the "standard" or "default" region to use when spinning up new US-based AWS services, is the oldest AWS center, has the most interconnected systems, and likely has the highest average load.

It makes sense that us-east-1 has reliability problems, but I wish Amazon was a little more upfront about some of the risks when choosing that zone.