It would be wonderful if you included limitations as well, to help people make the right decisions for their tech stack. I've been playing around with Prometheus lately for environmental monitoring, and long-term retention is particularly important to me.

During proof-of-concept testing, some historical data on disk perhaps wasn't lost per se, but definitely failed to load on restart. I haven't worked hard to replicate this but there are some similar unsolved tickets out there.

Additional traps for new players include customizing --storage.tsdb.retention.time and related parameters.