The session log channel has a bunch of these (about 100/sec). A lot of URLs that are loaded as assets (Special:CentralAutoLogin/*, Special:BannerLoader, Special:HideBanners, gadgets) but some normal pages as well. Mostly seems to come in batches: 5-10 log events with the same content and same uid.
Last 24 hours in Logstash: https://logstash.wikimedia.org/goto/c80940cd1442170eb706598fc54cdd06
As of December 2017: 240+ per day.