They're not hosted in multiple datacenters; there was a power interruption in their single datacenter that exposed this firmware bug. The point of this postmortem isn't the initial power interruption but rather its repercussions, why it took so long to recover from and how they can improve their response and communications in the future.
Ok...so this is another PR...without admitting the issue. I don't know github's infrastructure, but they have a single point of failure? Last I know, every place these days have backup power especially a datacenter...so those were not working either? My point is that it's much better to be upfront sometimes. In fact github didn't have to say anything about the whole thing since everyone forgot already...
