This shows up in the journal logs for refreshLinkRecommendations.php quite a bit. Presumably a missing task config page, but given our scaling plans, it needs to be handled more gracefully.
Mar 18 18:33:20 deployment-mwmaint01 mediawiki_job_growthexperiments-refreshLinkRecommendations[8835]: [6ee0cbbeb68586d5457c66de] [no req] TypeError: Argument 5 passed to GrowthExperiments\NewcomerTasks\TaskSuggester\LocalSearchTaskSuggester::__construct() must be of the type array, null given, called in /srv/mediawiki/php-master/extensions/GrowthExperiments/includes/NewcomerTasks/TaskSuggester/LocalSearchTaskSuggesterFactory.php on line 63 Mar 18 18:33:20 deployment-mwmaint01 mediawiki_job_growthexperiments-refreshLinkRecommendations[8835]: Backtrace: Mar 18 18:33:20 deployment-mwmaint01 mediawiki_job_growthexperiments-refreshLinkRecommendations[8835]: from /srv/mediawiki/php-master/extensions/GrowthExperiments/includes/NewcomerTasks/TaskSuggester/LocalSearchTaskSuggester.php(35) Mar 18 18:33:20 deployment-mwmaint01 mediawiki_job_growthexperiments-refreshLinkRecommendations[8835]: #0 /srv/mediawiki/php-master/extensions/GrowthExperiments/includes/NewcomerTasks/TaskSuggester/LocalSearchTaskSuggesterFactory.php(63): GrowthExperiments\NewcomerTasks\TaskSuggester\LocalSearchTaskSuggester->__construct(GrowthExperiments\NewcomerTasks\TaskType\TaskTypeHandlerRegistry, SearchEngineFactory, GrowthExperiments\NewcomerTasks\TaskSuggester\SearchStrategy\SearchStrategy, MediaWiki\Cache\LinkBatchFactory, NULL, array) Mar 18 18:33:20 deployment-mwmaint01 mediawiki_job_growthexperiments-refreshLinkRecommendations[8835]: #1 /srv/mediawiki/php-master/extensions/GrowthExperiments/includes/NewcomerTasks/TaskSuggester/DecoratingTaskSuggesterFactory.php(43): GrowthExperiments\NewcomerTasks\TaskSuggester\LocalSearchTaskSuggesterFactory->create() Mar 18 18:33:20 deployment-mwmaint01 mediawiki_job_growthexperiments-refreshLinkRecommendations[8835]: #2 /srv/mediawiki/php-master/extensions/GrowthExperiments/maintenance/refreshLinkRecommendations.php(222): GrowthExperiments\NewcomerTasks\TaskSuggester\DecoratingTaskSuggesterFactory->create() Mar 18 18:33:20 deployment-mwmaint01 mediawiki_job_growthexperiments-refreshLinkRecommendations[8835]: #3 /srv/mediawiki/php-master/extensions/GrowthExperiments/maintenance/refreshLinkRecommendations.php(118): GrowthExperiments\Maintenance\RefreshLinkRecommendations->initServices() Mar 18 18:33:20 deployment-mwmaint01 mediawiki_job_growthexperiments-refreshLinkRecommendations[8835]: #4 /srv/mediawiki/php-master/maintenance/doMaintenance.php(112): GrowthExperiments\Maintenance\RefreshLinkRecommendations->execute() Mar 18 18:33:20 deployment-mwmaint01 mediawiki_job_growthexperiments-refreshLinkRecommendations[8835]: #5 /srv/mediawiki/php-master/extensions/GrowthExperiments/maintenance/refreshLinkRecommendations.php(489): require_once(string) Mar 18 18:33:20 deployment-mwmaint01 mediawiki_job_growthexperiments-refreshLinkRecommendations[8835]: #6 /srv/mediawiki/multiversion/MWScript.php(101): require_once(string) Mar 18 18:33:20 deployment-mwmaint01 mediawiki_job_growthexperiments-refreshLinkRecommendations[8835]: #7 {main}