User blog comment:Rappy 4187/Technical Update: May 18, 2016/@comment-1251315-20160518201456/@comment-24739709-20160523174902

We haven't mentioned the Top Links module in the TU because it's just a test right now. We don't usually publish all our A/B tests in the TU, and this one is running on under 10% of traffic, so it's fairly small to begin with.