> The Postgres extension model to capture the metrics (we also experimented with eBPF, but it causes too many kernel-user space context switches when you can do the same in an extension without them), and a small sidecar to push the metrics out via a standardized protocol like OTEL.

The extension model is great, but it doesn't work with existing postgres providers (RDS, Aurora, etc.). Unless one such extension becomes standard enough that all providers will support it. That would be ideal, IMO.

To be clear, I don't mean pg_stat_statements, that is standard enough, but an extension that pushes the actual queries in real-time.

> If it's a network hop, then adds milliseconds, and not microseconds.

Are you talking about connection establishing time or for query delay? I think it should normally be under a millisecond for the later.