Add central notice cookie to x-analytics field in web-request logs
Quoting Ellery:
central notice manages a cookie called 'centralnotice_bannercount_fr12'. It simply counts how many banners the client has seen. I would like for the content of this cookie to be added to the x_analytics field.
With this information we can:
- Increase the accuracy of our testing by controlling some of the confound that comes from treatment groups with different banner impression histories
- Determine the optimum number of banners to show people. i.e. "its worth showing up to 30 instead of 5 impressions like we previously thought", or "after 5 impressions, the probability of getting a donation is so low that we should stop compromising the user experience with banners".
Both of this are pretty important for "baselining" this years fundraiser. I don't see any privacy concerns (its just a count, much less specific than for example the referer or ip/user_agent)
It would suffice to send it back only on webrequests where the uri_path=/wiki/Special:RecordImpression, but this may be harder to do than sending it back on every request.