Marostegui added a comment.

  Some more details.
  There were a few long running queries
  
    | 669154401 | wikiuser        | 10.64.0.59:40112   | wikidatawiki       | 
Query     |   95780 | Sending data                                   | SELECT 
/* SpecialRecentChanges::doMainQuery  */  
rc_id,rc_timestamp,rc_namespace,rc_title,rc_
  
  Those queries were running for hours and as the query killer wasn't enabled 
due to a mariadb 10.4 bug (T247728 
<https://phabricator.wikimedia.org/T247728>), they were causing 3-5 seconds of 
continued lag.

TASK DETAIL
  https://phabricator.wikimedia.org/T252952

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To: Addshore, Marostegui
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