gistfile1.txt

CREATE SCHEMA monitoring;

CREATE OR REPLACE FUNCTION monitoring.get_stat_statements() RETURNS SETOF pg_stat_statements AS
$$
  SELECT * FROM public.pg_stat_statements
  WHERE dbid IN (SELECT oid FROM pg_database WHERE datname = current_database());
$$ LANGUAGE sql VOLATILE SECURITY DEFINER;

CREATE USER monitoring PASSWORD 'mypassword';
REVOKE ALL ON SCHEMA public FROM monitoring;
GRANT USAGE ON SCHEMA monitoring TO monitoring;

After creating this with a super user, use

SELECT * FROM monitoring.get_stat_statements();

for querying as the monitoring user.