Not sure about the edits, but the title of the requests graph including "Varnish frontend CDN" and the query ("job_method_status:varnish_requests...") imply to me that those are the requests from a frontend cache (Varnish) or series of caches to the backend, rather than all requests.
(I'm not 100% sure you intended to suggest Wikipedia only gets 100k requests/s, I just thought it was an interesting discussion point.)
It has all the info about HTTP requests, DB info, CDN, etc.
The wiki page about this https://wikitech.wikimedia.org/wiki/Grafana