Lucas_Werkmeister_WMDE added a comment.

  Well, since the logging was deployed, we can at least look at it in Logstash:
  
  F34574570: Screenshot 2021-08-03 at 11-28-35 mediawiki-warnings - Elastic.png 
<https://phabricator.wikimedia.org/F34574570>
  
  That’s 7006 events over the past 7 days. The logged `sites` always seem to be 
a single-element array with the site the request was from, including at least 
one log event (probably many more) where it was querying for all links to 
enwiki 😱
  
  The stack trace indicates this is indeed from 
`ImplicitDescriptionUsageLookup`:
  
  name=exception.trace
    from 
/srv/mediawiki/php-1.37.0-wmf.16/extensions/Wikibase/lib/includes/Store/Sql/SiteLinkTable.php(307)
    #0 
/srv/mediawiki/php-1.37.0-wmf.16/extensions/Wikibase/lib/includes/Store/CachingSiteLinkLookup.php(93):
 Wikibase\Lib\Store\Sql\SiteLinkTable->getLinks(array, array, array)
    #1 
/srv/mediawiki/php-1.37.0-wmf.16/extensions/Wikibase/client/includes/Usage/ImplicitDescriptionUsageLookup.php(214):
 Wikibase\Lib\Store\CachingSiteLinkLookup->getLinks(array, array)
    #2 
/srv/mediawiki/php-1.37.0-wmf.16/extensions/Wikibase/client/includes/Usage/ImplicitDescriptionUsageLookup.php(137):
 Wikibase\Client\Usage\ImplicitDescriptionUsageLookup->findImplicitUsages(array)
    #3 
/srv/mediawiki/php-1.37.0-wmf.16/extensions/Wikibase/client/includes/Changes/AffectedPagesFinder.php(378):
 Wikibase\Client\Usage\ImplicitDescriptionUsageLookup->getPagesUsing(array, 
array)
    #4 
/srv/mediawiki/php-1.37.0-wmf.16/extensions/Wikibase/client/includes/Changes/AffectedPagesFinder.php(295):
 
Wikibase\Client\Changes\AffectedPagesFinder->transformAllPageEntityUsages(Generator,
 Wikibase\DataModel\Entity\PropertyId, array)
    #5 
/srv/mediawiki/php-1.37.0-wmf.16/extensions/Wikibase/client/includes/Changes/AffectedPagesFinder.php(95):
 Wikibase\Client\Changes\AffectedPagesFinder->filterUpdates(Generator)
    #6 
/srv/mediawiki/php-1.37.0-wmf.16/extensions/Wikibase/client/includes/Changes/ChangeHandler.php(125):
 
Wikibase\Client\Changes\AffectedPagesFinder->getAffectedUsagesByPage(Wikibase\Lib\Changes\EntityChange)
    #7 
/srv/mediawiki/php-1.37.0-wmf.16/extensions/Wikibase/client/includes/Changes/ChangeHandler.php(101):
 
Wikibase\Client\Changes\ChangeHandler->handleChange(Wikibase\Lib\Changes\EntityChange,
 array)
    #8 
/srv/mediawiki/php-1.37.0-wmf.16/extensions/Wikibase/client/includes/ChangeNotificationJob.php(113):
 Wikibase\Client\Changes\ChangeHandler->handleChanges(array, array)
    #9 
/srv/mediawiki/php-1.37.0-wmf.16/extensions/EventBus/includes/JobExecutor.php(79):
 Wikibase\Client\ChangeNotificationJob->run()
    #10 /srv/mediawiki/rpc/RunSingleJob.php(76): 
MediaWiki\Extension\EventBus\JobExecutor->execute(array)
    #11 {main}

TASK DETAIL
  https://phabricator.wikimedia.org/T276762

EMAIL PREFERENCES
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To: Lucas_Werkmeister_WMDE
Cc: Michael, Lucas_Werkmeister_WMDE, LSobanski, Addshore, Marostegui, hoo, 
Aklapper, jcrespo, Biggs657, Invadibot, Lalamarie69, maantietaja, Juan90264, 
Alter-paule, Beast1978, Un1tY, Akuckartz, Hook696, Iflorez, darthmon_wmde, 
Kent7301, alaa_wmde, joker88john, CucyNoiD, Nandana, Gaboe420, Giuliamocci, 
Cpaulf30, Lahi, Gq86, Af420, Bsandipan, GoranSMilovanovic, QZanden, 
LawExplorer, Lewizho99, Maathavan, _jensen, rosalieper, Scott_WUaS, 
Wikidata-bugs, aude, Lydia_Pintscher, Mbch331
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