10:55 on the 29th is the sharp increase of occurrences.
Happening for wikidatawiki
#0 /srv/mediawiki/php-master/extensions/Wikibase/repo/includes/Notifications/JobQueueChangeNotificationSender.php(80): JobQueueGroup->lazyPush(array) #1 /srv/mediawiki/php-master/extensions/Wikibase/repo/includes/ChangeDispatcher.php(243): Wikibase\Repo\Notifications\JobQueueChangeNotificationSender->sendNotification(string, array) #2 /srv/mediawiki/php-master/extensions/Wikibase/repo/maintenance/dispatchChanges.php(294): Wikibase\Repo\ChangeDispatcher->dispatchTo(array) #3 /srv/mediawiki/php-master/maintenance/doMaintenance.php(94): Wikibase\DispatchChanges->execute() #4 /srv/mediawiki/php-master/extensions/Wikibase/repo/maintenance/dispatchChanges.php(388): include(string) #5 /srv/mediawiki/multiversion/MWScript.php(100): include(string) #6 {main}
This is likely due to beta having no wikispecies