The old code is for Twitter's Open Source team. I looked at the reports while I was at Twitter and, y'know, had permission :-)
New Google Analytics tracking code for www.pantsbuild.org.
Review Request #3917 — Created May 20, 2016 and submitted
This is tied to the Google Analytics account associated with firstname.lastname@example.org. The old code was owned by someone at Twitter, and we don't know who. And in any case we want email@example.com to own this going forward, and we never looked at the old analytics (as we had no access to the account), so creating a new tracking code seems like the best way to go.
I'll look at the analytics in a few days and make sure the data is flowing correctly.