We currently use the Confluence forum functionality provided through the Community Bubbles plugin
You can follow a forum or topic, by using the Watch Page Family link in the Tools drop down in the top right corner.
Because of TOOL-5 The automatic indexing isn't running in Confluence the forum overview will not be updated before a Confluence reindex has been triggered manually (happens a couple of times a day)
Design forum (NetarchiveSuite) — Discussion concerning the design of the NetatchiveSuite. This includes 'micro' code constructs.
Code guidelines (Applications) — Discussions related to the code style checks performed by Maven