One of my crowning Engineering achievements was a Zombie Webapp. I owned the entire server side, and spent about 8 months building something robust, but with a

One of my crowning Engineering achievements was a Zombie Webapp. I owned the entire server side, and spent about 8 months building something robust, but with a small server footprint. As it turns out, our investor hated the app that it powered, so we shut it all down...or so we thought. 18 months later, we started getting disk-space alerts as the DB file system filled up. As it turns out, we'd gotten rid of all of our alerting & monitoring except for the "last resort" fallbacks, which were starting to fire. The system had performed its task flawlessly for the entire time.