ajjahn/puppet-dns — pull request #25 by kubashin-a (2013-08-16 06:02:51+00:00)
Title: Add basic support for update zone-serial only on change zone-records

This is not my current production version and need some testing.
I tested it on Ubuntu 12.04 and it's work, but for Debian Squueze need small changes (see comment on exec{} in zone.pp).
If you are interested in patch i am ready to work on it further.