>
> We found out because we are monitoring long running queries, and saw it
> had been running for a month before the restart yesterday.
> I just queried pg_stat_activity and it seems to be running since then.
>
> taimusz=# SELECT pid, query_start, usename, left(query,70)
> FROM pg_stat_activity
> WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'
> ORDER BY query_start;
> pid | query_start | usename
> | left
>
> ---------+-------------------------------+------------+------------------------------------------------------------------------
> 2321161 | 2021-05-17 16:15:13.906679+02 | subscriber | SELECT
> pg_catalog.set_config('search_path', '', false);
>
>
>
You should add: AND state != 'idle' to filter out queries that are no
longer running and don't have an open transaction. Your query is finding
long running sessions, not necessarily long running queries.