gh-112169: Documented getaddrinfo/getnameinfo default loop executor usage and implications. (#112191)

Co-authored-by: Guido van Rossum <gvanrossum@gmail.com>
Co-authored-by: Kumar Aditya <kumaraditya@python.org>
Co-authored-by: Carol Willing <carolcode@willingconsulting.com>

Author: 4 people

Doc/library/asyncio-eventloop.rst

@@ -1155,6 +1155,14 @@ DNS
 
    Asynchronous version of :meth:`socket.getnameinfo`.
 
+.. note::
+   Both *getaddrinfo* and *getnameinfo* internally utilize their synchronous
+   versions through the loop's default thread pool executor.
+   When this executor is saturated, these methods may experience delays,
+   which higher-level networking libraries may report as increased timeouts.
+   To mitigate this, consider using a custom executor for other user tasks,
+   or setting a default executor with a larger number of workers.
+
 .. versionchanged:: 3.7
    Both *getaddrinfo* and *getnameinfo* methods were always documented
    to return a coroutine, but prior to Python 3.7 they were, in fact,