jenkinsci/git-plugin — pull request #180 by orrc (2013-11-13 13:56:37+00:00)
Title: If building from a tag, export the commit message as GIT_TAG_MESSAGE.

We find it useful to have easy access to the git tag message during a build, as we can use this as release notes, e.g. when uploading a mobile app with the HockeyApp plugin.