It may not be the appropriate parameter name to use, but this sort of technique may help:

https://wikitech.wikimedia.org/wiki/Provenance

You'd want to look at the current VCL in templates/varnish in the operations repo to see how it's presently done for wprov.

-Adam

On Wed, Aug 26, 2015 at 4:00 PM, Erik Bernhardson <ebernhardson@wikimedia.org> wrote:

On Wed, Aug 26, 2015 at 3:58 PM, Chad Horohoe <chorohoe@wikimedia.org> wrote:

Aren't we uncached here anyway? Special pages and all.

-Chad

Actually the events we are recording here measure the users interaction with the pages they found. The current idea is to add a query parameter to all search results (only for users in the test, from javascript) so that when they land on that page we know they came from search and start collecting interaction events.

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