The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/16/sql-notify.html
Description:
It would be good to add to the notes section that use of NOTIFY especially
within a TRIGGER requires an AccessExclusiveLock which may cause performance
issues. Old thread for reference:
https://www.postgresql.org/message-id/3598.1363354686%40sss.pgh.pa.us