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Xbox network was _designed_ for such concurrency, GitHub is Ruby on rails + vitess (mysql).

Not comparable at all. Xbox would be mostly transient traffic. It's probably not much more than packet forwarding for a lot of traffic.

Github is a giant complicated stateful mess with a lot of reads and writes. It also has a lot of features at this point. Hard to scale and hard to optimize.

I think this is minimizing the Xbox platform. They are also a massive digital distribution platform where almost every game is a digital download now.

That being said, you are correct. It is absolutely no surprise to me that Actions has the worst uptime.

Do they run Xbox network on Azure or is it a separate thing?