Hi, I collected some statistics about the number of extensions (various figures from different sources) and their quality (mainly using categories here on MW.org). Are these statistics interesting from your point of view? if so, some script could be written to automate the process.
Do you see other figures, which could be interesting? I have some idea that the number of extensions with automated tests would be interesting (it’s a sign of very good health for an extension to have such tests), but I don’t think there is an easy way to create this number. A further step could then to have the number of extensions, which pass (e.g.) 95% of automated tests with MediaWiki last version.