https://bugzilla.wikimedia.org/show_bug.cgi?id=46014

--- Comment #15 from Gabriel Wicke <gwi...@wikimedia.org> ---
We discussed this in the office a few days ago. The updated revision ID in the
HTML means that the front-end cache was properly purged. 

Some possible issues to check:

* Bad parser cache validation.

* PHP reading some information from MySQL master (the revision id used for the
footer) while using lagged slaves for other info (the revision id used for
parser cache validation / parsing).

Since this is relatively rare it could be a race condition, where an anon
request happens shortly after an update. It might help to correlate edit
timestamps with render timestamps in the bad HTML and slave lag at the time.

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