https://bugzilla.wikimedia.org/show_bug.cgi?id=53806

[email protected] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #19 from [email protected] ---
Although there are no more mistagged lines since 2013-09-26 22:57,
there was some further discussion outside of bz, as we did not see the
expected change in number of total zero requests.

Neither a change in total zero requests per carrier.

Neither a change in the distribution of User-Agents, Accept-Language,
or X-Forwarded-For distribution per carrier.

This does not match the bug description of the zero tags being wrong.

Adam however came up with a different explanation: Maybe the zero tags
were not wrong, but the client ips were wrong. This would nicely explain
what we saw before and after the fixes. We're tagging the same traffic
as before, but this time with correct IP addresses. And code-wise, it
seems plausible as well, as the switch to netmapper in
  1755cfe5d556f20acae6a9c3cb59e9b38e1327e3
removed the hacky spoof_clientip function.

Although the above commit has only been merged on 2013-09-26 23:22
(~25 minutes /after/ the last mistagged line), Adam's explanation
seems nevertheless plausible, as the fixes were tested manually on the
varnishes beforehand.

It seems the combination of Faidon's and Brandon's patches finally
fixed the bug for good, and allow to explain the data that we're seeing.

Thanks Faidon and Brandon!

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