somehow they managed to build complex systems like gmail, continuously develop new features there and not have massive outages due to "migrations" - suggests that something that they were doing right, they are no longer able to do
- YouTube outage this November 2020
- August 2020 outage of Google Suite including Gmail
in both cases no postmortems were published
For the August outage, I believe there was a public pm. That said I can't find it now (I think there was some link rot somewhere, and I've escalated about that).