Sure, off the top of my head: - Explain plans for slow queries, via auto_explain in Postgres. You could get really fancy here and convert the pieces of an expl

Sure, off the top of my head: - Explain plans for slow queries, via auto_explain in Postgres. You could get really fancy here and convert the pieces of an explain plan (Aggregate, ModifyTable, FullTableScan) into proper distributed traces. Hard to tell, but it looks like GCP might offer that. - Various errors logs associated with queries that require more detail than a SQL state code. For example, lock timeouts. - Debugging, especially root cause analysis when you're trying to figure out why something broke. The trace IDs help build up context.