On Tue, Mar 10, 2015 at 11:26 AM, Adam Baso <abaso@wikimedia.org> wrote:

We're going to use the following format:

?wprov=<3_char_feature><platform_one_char><major_version_of_feature_uint>

Don't forget to document this publicly once it is deployed. https://www.mediawiki.org/wiki/Manual:Parameters_to_index.php is probably a good place for that (even though technically these are not related to index.php, but that page is where I would look if I saw a new parameter and had no idea what's going on).