https://bugzilla.wikimedia.org/show_bug.cgi?id=63249

            Bug ID: 63249
           Summary: Uncacheable RecentChanges feed, outlier in frontend
                    cache misses
           Product: MediaWiki
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Special pages
          Assignee: wikibugs-l@lists.wikimedia.org
          Reporter: fai...@wikimedia.org
       Web browser: ---
   Mobile Platform: ---

On text Varnishes the misses list shows this URL: 
/w/api.php?hidebots=1&days=7&limit=50&hidewikidata=1&action=feedrecentchanges&feedformat=atom
as an outlier, with receiving approx 1700 req/min right now. For reference, the
second on that list (also an outlier, probably a bug) is receiving 70 req/min.

From the headers, I see that it's all Cache-Control: private, expires
immediately.

I have no data on when this began and it could be old, but I don't remember
seeing it before. From the git logs I see commit
I06ee0f01d896bc66545a1800b24693ce7524e433 (ChangesListSpecialPage: Separate all
functionality for generating feeds) that changed some feed internals and URLs,
so perhaps this is related?

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