[bomdo]

I'd love to learn more about their canary rollouts. Is there any more info from either them or similar large sites about this?

For example, what usually has to happen for a dev to trigger a rollback? Or how do they handle stateful changes such as database schema changes?

[t3rabytes]

Re db migrations: they've built their own DB management tooling (https://github.com/openark/orchestrator) and online migration tooling (https://github.com/github/gh-ost)

[abrkn]

Is there anything like this for PostgreSQL?

[jules2689]

We monitor Datadog dashboards, exceptions, and other metrics mainly, as well as smoke testing the application