This having said…
I feel like having to mention that Discourse, as every other forum, has a 
search button. And even if you search for a rather generic term like numbers, you will find the Discourse post by @tfoote on The 2018 ROS metrics report.
and as you, @OpenR2, are “putting together a presentation” you should look up the diagrams that @DLu has plotted in that post - as they should be perfect input for shiny slides…
Good luck with your presentation.