Beta is currently hitting that endpoint and production wikis will start doing the same once they start running 1.25wmf22
All views coming from Media Viewer will be hitting that endpoint. Note that there might be some loss of hits on browsers that don't support sendBeacon, since our fallback is a simple async AJAX request (we haven't tried to go beyond that with local storage and replaying the event, etc.) and this event might be fired in situations of tab/browser close as well as navigating away from the page. Thus keep in mind that a steady small increase of those hits over a long period of time might simply be the natural process of people upgrading their browsers to more modern ones.