Since 01:00:00 UTC today, mediawiki-errors and memcached dashboards in logstash are flooding with:
Memcached error for key "commonswiki:pcache:idhash:28455663-0!*!0!!en!*!*" on server "/var/run/nutcracker/nutcracker.sock:0": SERVER ERROR
Several hits per minute, continuous for the past 2 hours.
Most entries are coming from job runners for commonswiki for jobs refreshLinks or cirrusSearchLinksUpdatePrioritized.
May be related: