https://bugzilla.wikimedia.org/show_bug.cgi?id=54782

--- Comment #6 from Faidon Liambotis <[email protected]> ---
I don't understand the question or what UDP-based has to do with anything. It's
incorrect that we don't use X-Analytics for anything Zero related -- Varnish
stores the carrier (X-CS) into the "zero" X-Analytics key.

I'm saying that doing this is fine for mobile/zero traffic (mobile Varnish
cluster), since we do carrier detection in that request path anyway, for the
carrier banners, and copying a header into another header is not a big effort.

Doing carrier detection in realtime for other kinds of traffic (e.g. upload),
though, is costly and there's no benefit compared to doing it on the log
processing pipeline, as far as I'm aware.

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