I had a useful conversation about Puppet changes with Mark and Faidon. The outcome is this: the conditions under which I am allowed to merge Puppet changes are:

2) The change has been +1'd by an ops team member with sufficient domain expertise

Sometimes you guys add me as the sole reviewer of small Puppet changes. Please be aware that I am not able to merge those changes on my own, and help me out by adding some relevant opsen. Giuseppe (_joe_ on irc) is my buddy for mediawiki-related changes so he's a good person to add. Adding whomever is on RT duty is probably a good idea as well. You can still add me for initial review and +1 / -1.