Analytics needs to know which reports at
stats.wikimedia.org people are
using. They will be decommissioning it around the end of the year, but
plan to re-implement/port the most important reports. Please comment at
https://phabricator.wikimedia.org/T107175 if you use any in particular.
Aggregate User Agent information (which I think is the one I've used the
most) is already listed.
Matt