I believe it is by group - AWS started the weekly operations meeting, effectively every service's oncall from the last week had to attend. Then it grew massive, so they made it optional. Alexa had a similar meeting that tried to replicate what AWS did. A lot of time spent reviewing load tests getting ready for holiday season, prime day, and the superbowl (super bowl ads used to cause crazy TPS spikes for Alexa). And a lot of finger pointing if there was an outage from one team. While it probably did help raise the operational bar, so much time wasted by engineers on busywork/paperwork documenting an error or fix vs improving the actual service.