I thought it was something native.
I am using this code - fx-builder/includes/updater.php at af2f1eea07a5a26f17b6932955f50220d0566b1d · wolffe/fx-builder · GitHub - and I have statistics server side.
I want to turn this into a self-managed plugin, so you can manage the files, the JSON code and the releases from your own WordPress/ClassicPress installation. I started a thread a while ago, here - Selling plugins and themes