query to find all dblink() Besides manually searching for all the dblink() used in triggers/functions/stored procedures is there a way to query for this information?

Example: There is a dblink inside of a trigger, can I select something from the postgres schema that would identify this?

I'm thinking this is a manual effort but asking just to make sure I'm not missing something.

NOTE: I have some logging where I am also looking for dblink()
I would draw a text backup and search it with vim or any tool of your choice.

As far as plpgsql functions are concerned (there is one behind every trigger), you can query the system catalog pg_proc:

SELECT *
FROM   pg_catalog.pg_proc
WHERE  prosrc ILIKE '%dblink%';