Heroku is now counting add-on resources instead of apps running

Heroku has changed their front page counter from showing the number of apps running to showing the number of add-on resources connected. Quite a big change as the app counter has been a prominent feature of the front page for as long as I can remember. I wonder what the number includes? And whether it's only add-ons provided through the add-on provider program, or it also includes "internal" add-ons like shared databases? If it does include shared databases the number is quite interesting, considering that a shared db is created along with an app. I'm guessing this isn't the case as there were some 130.000+ apps running last time I checked.