IMO looking at the root causes here isn't that helpful. Software is complicated and there will always be some unknown bottleneck or bug lurking to knock you ove

IMO looking at the root causes here isn't that helpful. Software is complicated and there will always be some unknown bottleneck or bug lurking to knock you over on a bad day. The important lessons here are about: * How their system architecture made them particularly vulnerable to this kind of issue * Their actions to diagnose and attempt to mitigate the issue * The whole later part about effectively cold-starting their entire infrastructure, all while millions of users were banging on their metaphorical door to start using the service again.