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Under what circumstances would the following query be extra slow?
SELECT pg_catalog.to_char(pg_catalog.pg_postmaster_start_time(), 'YYYY-MM-DD HH24:MI:SS.MS TZ'), CASE WHEN pg_catalog.pg_is_in_recovery() THEN 0 ELSE ('x' || pg_catalog.substr(pg_catalog.pg_walfile_name(pg_catalog.pg_current_wal_lsn()), 1, 8))::bit(32)::int END, CASE WHEN pg_catalog.pg_is_in_recovery() THEN 0 ELSE pg_catalog.pg_wal_lsn_diff(pg_catalog.pg_current_wal_lsn(), '0/0')::bigint END, pg_catalog.pg_wal_lsn_diff(pg_catalog.pg_last_wal_replay_lsn(), '0/0')::bigint, pg_catalog.pg_wal_lsn_diff(COALESCE(pg_catalog.pg_last_wal_receive_lsn(), '0/0'), '0/0')::bigint, pg_catalog.pg_is_in_recovery() AND pg_catalog.pg_is_wal_replay_paused(), pg_catalog.to_char(pg_catalog.pg_last_xact_replay_timestamp(), 'YYYY-MM-DD HH24:MI:SS.MS TZ'), pg_catalog.array_to_json(pg_catalog.array_agg(pg_catalog.row_to_json(ri))) FROM ( SELECT (SELECT rolname FROM pg_authid WHERE oid = usesysid) AS usename, application_name, client_addr, w.state, sync_state, sync_priority FROM pg_catalog.pg_stat_get_wal_senders() w, pg_catalog.pg_stat_get_activity(pid) ) as ri;
This is regarding Patroni--I haven't yet dug into that source to see how long that timeout is. PG 13.3, monitoring did not show heavy load nor unusual lock activity around when this happened.
