[Interest] Gerrit questions

[Jason H]

I'm trying to push code to gerrit, but I'm having some issues. I've fought through many already, but  I'm at  
! [remote rejected] HEAD -> refs/for/dev/osx_recording_params (missing Change-Id in commit message footer)
error: failed to push some refs to 'ssh://scorp1us@codereview.qt-project.org:29418/qt/qtmultimedia.git' 

I find plenty of info on how to set the hook, but not how to _obtain_ and the change-id.