How exactly do config files tell us what the WMF is retaining? That the error logs are manually purged tells us that they are in fact retaining details. What I asked was an official statement of what and for how long. The config files do not answer that question.

At any rate you didn't link to them anyway, not in this thread.

In a message dated 11/28/2010 5:37:18 P.M. Pacific Standard Time, aude.wiki@gmail.com writes:

The WMF server config files are there for everyone to see. Do you not consider them "reliable" source? Do you not believe they are in fact the server config settings used by WMF?

There are apache error logs (notice LogLevel) that are collected. Those are manually purged, as of 2008. (source: Tim Starling http://lists.wikimedia.org/pipermail/foundation-l/2008-September/045811.html )