Make sure you have solid Linux system monitoring in general. About 50% of running Ceph successfully at scale is just basic, solid system monitoring and alerting.

This line of advice basically comes down to: have a competent infrastructure team. Sometimes you gotta move fast, but this is where having someone on infrastructure that knows what they are doing comes in and pays dividends. No competent infra guy is going to NOT set up linux monitoring. But you see some companies hit 100 people and get revenue then this type of thing blows up in their face.