https://www.pgadmin.org/docs/pgadmin4/latest/debugger.html

postgresql.conf
    shared_preload_libraries = ‘$libdir/plugin_debugger’
    # after modifying - restart the server to apply the changes.

2021
EDB - pgAdmin Debugger Tool of 7:43
    https://www.youtube.com/watch?v=wYyUjmnsbT4