[tom1337]

Isn't east one the "core" datacenter and also the oldest? I'd imagine it has more load than the other regions and also has more tech debt and architectural / engineering debt because they had less experience when they built it. Also iirc some services rely on east-1 as a single point of failure for configuration (like IAM or some S3 stuff?)

[__turbobrew__]

What I have seen at other companies is that the older datacenters have suboptimal designs which are impossible to fix after the fact.

[doitLP]

Yes it tends to have the most things running in it, including backbone and internal services that only exist in that region.