Which types of instancing are live?

I can’t seem to find a definitive, authoritative source that verifies whether or not instancing is live for the various types of models (Mesh/CSG/Parts). I found the forum announcement on part instancing, but it seems to have ended in 2018 with some question as to the status. Roblox roadmaps for 2018-2020 don’t seem to mention it. I started going through release notes, but that didn’t seem like a great way to go for finding out this kind of info.

  1. Where should I be looking for this info?
  2. If there isn’t a place, do you know the status?

Bonus question: The announcement post about part instancing includes a nice explanation of the “clusters” line in the Ctrl-Shift-F2 stat pane. In the middle of that panel are several lines starting with “Draw”. What does the first number (after the ‘:’) represent?

Thanks!