Report the number of active users to the the-federation.info
The number of active users is not reported in the-federation.info pleroma page (or the pages of any of it's instances).
the benefits of reporting the active users count are:
it would show more of the federation active users, having a bigger count of the federation could show it’s popular and might attract more people.
You could see how many active users each instance has, so if a instance has a lot of users or it’s graph is showing growth ( e.g. ) you could assume it indicates (in a wisdom of the crowds sort of way) it is a good instance and has a smaller chance of disappearing.
Peertube recently implemented this, you can look at their github issue for reference if your interested.