As posted on the munki-dev list by Greg Neagle and posted https://github.com/munki/munki/wiki/Discussion-Group, a list of discussion groups related to Munki:

Discussion group for the development of Munki is here: http://groups.google.com/group/munki-dev

Other related discussion groups:
General Munki discussion: https://groups.google.com/forum/#!forum/munki-discuss
MunkiAdmin: https://groups.google.com/forum/#!forum/munkiadmin
MunkiReport: https://groups.google.com/forum/#!forum/munkireport
MunkiWebAdmin: https://groups.google.com/forum/#!forum/munki-web-admin
Sal: https://groups.google.com/forum/#!forum/sal-discuss
Simian: https://groups.google.com/forum/#!forum/simian-discuss