We are printing the Explain Analyze plan for the slow queries using auto_explain extension. To do more analysis, I think it would be nice to print sql_hash and plan_hash along with the explain plan.
Currently from the docs I don't see a way todo this.
you're right it's not currently possible, but this feature was added last month and will be available with pg16. note that I'm only talking about the query_id (which should be what you call query hash) as there's no plan hash in postgres itself. there are exceptions for that like pg_store_plans but those can't add information to auto_explain output.