https://bugzilla.wikimedia.org/show_bug.cgi?id=61063

--- Comment #2 from Oliver Keyes <oke...@wikimedia.org> ---
Further investigation:

*I went through some of the requestlogs manually and found duplicate requests,
about 9-10ms apart, the latter of which had the MIME type and referer stripped.
This could be the source of both the MIME type data loss and the referer data
loss we've seen with Special:BannerRandom hits. Matt Walker theorises that the
problem may be us consuming requestlog data from multiple layers of varnish
machines, and thus getting the same requests multiple times. I'm going to yank
out the hostnames for the weird hinky hits I've noticed to see.

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