shared_preload_libraries = 'pg_stat_statements'		# (change requires restart)
pg_stat_statements.max = 10000
pg_stat_statements.track = all

SELECT userid, dbid, query , calls , round(total_time) as total_time , rows as total_rows,  round(total_time/calls) as average_time, round(rows/calls) as average_rows,
       100.0 * shared_blks_hit / nullif ( shared_blks_hit + shared_blks_read , 0) AS hit_percent
FROM pg_stat_statements 
WHERE query ILIKE '%my_function(%'  -- пример фильтрации по имени функции
ORDER BY total_time DESC
LIMIT 20;