(cc-ing analytics list)
Jon:
To get a prompt response please cc analytics or analytics-internal on e-mails that way -given that we operate in three timezones- someone is bound to see your e-mail and respond in a timely fashion.
>Right now the Gather feature is only available/discoverable on mobile web beta for english wikipedia.
I assume "mobile web beta" is deployed to enwiki in production just like an special "skin" or 'extension.
>Mobile web beta does not have any special url. It is triggered by a cookie.
If the that identifies 'mobile-web-beta' is stripped off in varnish (something you can ask your devs about) then there is no way for you to see that traffic. (this is the most-likely case I was looking around and couldn't find any code that would be persisting this cookies further than varnish).
However, if the cookie value is persisted to x-analytics field then records are "findable".
Now, if there are any javascript/css files ONLY used by the "mobile web beta feature" you could do a (very, very) rough estimation of requests by looking at those. Probably you want to team up with a developer to find out whether this is possible.