Lucas_Werkmeister_WMDE added a comment.

  > We were able to observe (in two separate SQL requests) that the `C.XXX` 
statements were completely absent and then were inserted again
  
  Specifically, we saw for **eowiki:Perseo 
<https://eo.wikipedia.org/wiki/Perseo>** (arbitrary test page):
  
    mysql:[email protected] [eowiki]> SELECT * FROM 
wbc_entity_usage WHERE eu_page_id = 115136 AND eu_entity_id = 'Q130832';
    +-----------+--------------+-----------+------------+
    | eu_row_id | eu_entity_id | eu_aspect | eu_page_id |
    +-----------+--------------+-----------+------------+
    |   9821865 | Q130832      | C         |     115136 |
    |    506488 | Q130832      | S         |     115136 |
    |   7737086 | Q130832      | T         |     115136 |
    +-----------+--------------+-----------+------------+
    3 rows in set (0.001 sec)
    
    mysql:[email protected] [eowiki]> SELECT * FROM 
wbc_entity_usage WHERE eu_page_id = 115136 AND eu_entity_id = 'Q130832';
    +-----------+--------------+-----------+------------+
    | eu_row_id | eu_entity_id | eu_aspect | eu_page_id |
    +-----------+--------------+-----------+------------+
    |   9821865 | Q130832      | C         |     115136 |
    |  13242857 | Q130832      | C.P1015   |     115136 |
    |  13242858 | Q130832      | C.P1053   |     115136 |
    |  13242832 | Q130832      | C.P1559   |     115136 |
    |  13242833 | Q130832      | C.P21     |     115136 |
    |  13242847 | Q130832      | C.P213    |     115136 |
    |  13242846 | Q130832      | C.P214    |     115136 |
    |  13242836 | Q130832      | C.P22     |     115136 |
    |  13242843 | Q130832      | C.P225    |     115136 |
    |  13242844 | Q130832      | C.P227    |     115136 |
    |  13242845 | Q130832      | C.P244    |     115136 |
    |  13242853 | Q130832      | C.P245    |     115136 |
    |  13242837 | Q130832      | C.P25     |     115136 |
    |  13242838 | Q130832      | C.P26     |     115136 |
    |  13242834 | Q130832      | C.P263    |     115136 |
    |  13242850 | Q130832      | C.P268    |     115136 |
    |  13242849 | Q130832      | C.P269    |     115136 |
    |  13242856 | Q130832      | C.P349    |     115136 |
    |  13242842 | Q130832      | C.P373    |     115136 |
    |  13242861 | Q130832      | C.P396    |     115136 |
    |  13242839 | Q130832      | C.P40     |     115136 |
    |  13242855 | Q130832      | C.P409    |     115136 |
    |  13242854 | Q130832      | C.P434    |     115136 |
    |  13242840 | Q130832      | C.P451    |     115136 |
    |  13242835 | Q130832      | C.P460    |     115136 |
    |  13242851 | Q130832      | C.P496    |     115136 |
    |  13242859 | Q130832      | C.P650    |     115136 |
    |  13242852 | Q130832      | C.P651    |     115136 |
    |  13242860 | Q130832      | C.P691    |     115136 |
    |  13242848 | Q130832      | C.P906    |     115136 |
    |  13242841 | Q130832      | C.P935    |     115136 |
    |  13242862 | Q130832      | C.P950    |     115136 |
    |    506488 | Q130832      | S         |     115136 |
    |   7737086 | Q130832      | T         |     115136 |
    +-----------+--------------+-----------+------------+
    34 rows in set (0.001 sec)
  
  
  
  > We are not able to exclude that the mwdebug1001 server was not correctly 
sending log events.
  
  I’m also not entirely sure if mwdebug ensures that jobs queued by it only run 
on mwdebug as well; if it doesn’t, then a related job might have run on a 
non-mwdebug host that didn’t have the logging code.

TASK DETAIL
  https://phabricator.wikimedia.org/T255706

EMAIL PREFERENCES
  https://phabricator.wikimedia.org/settings/panel/emailpreferences/

To: Lucas_Werkmeister_WMDE
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