Hello everyone!
As you might have noticed, Tor Browser 13 got released last week[1] which ships for the first time a Tor 0.4.8.x version (0.4.8.7) to our stable Tor Browser users. One of the main features in the 0.4.8.x series is Conflux, which allows traffic-splitting to improve Tor performance.[2]
Given that we assume Tor Browser users are a large fraction of our overall Tor users and 0.4.8.7 deployed by Tor Browser results in pre-built Conflux circuits, there is a chance that exit nodes on 0.4.7.x might see less traffic over time. An easy way to avoid or fix that problem is an upgrade to the 0.4.8.x series.
Georg
[1] New release: Tor Browser 13.0 | The Tor Project
[2] proposals/329-traffic-splitting.txt · 288c5134ddb737e321cf352a9c80bbe595812bce · The Tor Project / Core / Tor Specifications · GitLab