User blog comment:TOR/Busy Week for the Tech Team/@comment-168424-20110520203757/@comment-161697-20110521013426

This actually does happen more then you can notice in off the grid places. More and more recently, the many problems that make it live are sometimes not reproducible until under a larger load, or under the same cache/apache/varnish conditions of the production environment, or just subject to the thousands of differences in mediawiki configuration that our wikis are under. And remember, our devs are still human.