Requests for comment/Automata tagging in x analytics

Background
Wikimedia's servers receive around 7-8B requests for assets a day, from all over the world. Many of these requests come from human users directly through their browsers, be they mobile or desktop, but many more come from automated systems. These automated requests do sometimes have humans behind them; they cover a variety of use cases. These include:


 * 1) Automated requests made through semi-automated editing tools, where there is a single user behind each unique source of requests;
 * 2) Automated requests made through fully-automated tools, such as research code or "bots", where no human review is involved;
 * 3) Automated requests made through fully-automated caching systems, such as third-party reusers that ask for content they're missing when a user asks for it but then caches the result for future reuse.