Comment 2 for bug 407234

It's an interesting idea. Really, it should be done in such a way so that hooks can be added to catch all new branch events at the following levels:
  - owned by a Person
  - subscribed by a Person
  - in a project group
  - in a project
  - in source package
  - in a distro source package
  - in a distribution

Since each of these is a meaningful container of branches.

Given that we already have to do something like this for sending out email, the extra effort of having a hook at each of those levels ought not be too hard. If it is, we should make it easier :)

Also, there are murmurings of Launchpad growing a messaging system. If we had something like that, then perhaps this should simply be an XMPP <-> webhook adapter?