CREATE EXTENSION pg_wait_sampling;
\d pg_wait_sampling_current
View "public.pg_wait_sampling_current"
   Column   |  Type   | Modifiers 
------------+---------+-----------
 pid        | integer | 
 event_type | text    | 
 event      | text    | 
 queryid    | bigint  | 

\d pg_wait_sampling_history
      View "public.pg_wait_sampling_history"
   Column   |           Type           | Modifiers 
------------+--------------------------+-----------
 pid        | integer                  | 
 ts         | timestamp with time zone | 
 event_type | text                     | 
 event      | text                     | 
 queryid    | bigint                   | 

\d pg_wait_sampling_profile
View "public.pg_wait_sampling_profile"
   Column   |  Type   | Modifiers 
------------+---------+-----------
 pid        | integer | 
 event_type | text    | 
 event      | text    | 
 queryid    | bigint  | 
 count      | bigint  | 

DROP EXTENSION pg_wait_sampling;