postgres=# show shared_preload_libraries;             shared_preload_libraries--------------------------------------------------- timescaledb, pg_stat_statements, pg_wait_sampling(1 row)postgres=# \dx                                         List of installed extensions        Name        | Version |   Schema   |                            Description--------------------+---------+------------+------------------------------------------------------------------- pg_stat_statements | 1.6     | public     | track execution statistics of all SQL statements executed pg_wait_sampling   | 1.1     | public     | sampling based statistics of wait events plpgsql            | 1.0     | pg_catalog | PL/pgSQL procedural language timescaledb        | 1.5.0   | public     | Enables scalable inserts and complex queries for time-series data(4 rows)postgres=# show pg_wait_sampling.profile_queries ; pg_wait_sampling.profile_queries---------------------------------- on(1 row)

begin;truncate a;

insert into a values (1)

postgres=# select * from pg_wait_sampling_current where event = 'relation'; pid | event_type |  event   | queryid-----+------------+----------+--------- 634 | Lock       | relation |       0(1 row)