The tool that supports this functionality has long since ceased to exist.19:23, 2 December 2014 (UTC).

This template tags categories to be logged by CatTrack. CatTrack logs the population of categories (tagged with {{CatTrack}}) so that they can be tracked over time. For example: Here is the CatTrack page for the population of Category:All unreferenced BLPs.

[१] A full list of tracked categories.