PEP 588: add how to nosy the expert (python#1141)

Also mention that discussions can happen in Discourse.

pep-0588.rst

@@ -210,16 +210,21 @@ For GitHub, we need to add ``origin: https://bugs.python.org/issueXYZ``.
 For bpo, add a new field ``moved to:
 https://github.com/python/cpython/issue/XYZ``.
 
+Nosy-ing the expert
+-------------------
 
-Open issues
-===========
+A current functionality in bpo is to automatically nosy people who are listed
+as an expert of certain area. Several Python core developers have expressed that
+they prefer not having to subscribe to everything on GitHub, but only getting notified
+for issues related to their area of interest and expertise.
 
-Experts index
--------------
-
-At the moment, there is a mechanism to automatically add people in the experts
-index to the nosy list. We need to replicate this functionality.
+To help with this situation, we can develop a bot that can notify people
+whenever an issue has been categorized using labels. For example, when an issue
+was labeled with `area-windows`, the windows experts can be notified.
+The notification can be in the form of email notification, or @-mention on GitHub.
 
+Open issues
+===========
 
 A GitHub account should not be a requirement
 --------------------------------------------
@@ -267,7 +272,9 @@ Further questions and discussions
 
 There is a dedicated `#pep581
 <https://python.zulipchat.com/#narrow/stream/130206-pep581>`_ stream
-in python.zulipchat.com.
+in python.zulipchat.com. Alternatively, you can post questions
+on Discourse under the
+`Core-Workflow <https://discuss.python.org/c/core-workflow>`_ category.
 
 
 Acknowledgements