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Backtrace:

#0 /var/www/production/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(937): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#1 /var/www/production/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(904): Wikimedia\Rdbms\LoadBalancer->getServerConnection()
#2 /var/www/production/w/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1049): Wikimedia\Rdbms\LoadBalancer->getConnection()
#3 /var/www/production/w/includes/GlobalFunctions.php(2463): Wikimedia\Rdbms\LoadBalancer->getMaintenanceConnectionRef()
#4 /var/www/production/w/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(106): wfGetDB()
#5 /var/www/production/w/includes/libs/objectcache/wancache/WANObjectCache.php(1529): MediaWikiGadgetsDefinitionRepo->{closure}()
#6 /var/www/production/w/includes/libs/objectcache/wancache/WANObjectCache.php(1376): WANObjectCache->fetchOrRegenerate()
#7 /var/www/production/w/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(116): WANObjectCache->getWithSetCallback()
#8 /var/www/production/w/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(32): MediaWikiGadgetsDefinitionRepo->loadGadgets()
#9 /var/www/production/w/extensions/Gadgets/includes/GadgetRepo.php(71): MediaWikiGadgetsDefinitionRepo->getGadgetIds()
#10 /var/www/production/w/extensions/Gadgets/includes/GadgetHooks.php(114): GadgetRepo->getStructuredList()
#11 /var/www/production/w/includes/HookContainer/HookContainer.php(329): GadgetHooks::userGetDefaultOptions()
#12 /var/www/production/w/includes/HookContainer/HookContainer.php(132): MediaWiki\HookContainer\HookContainer->callLegacyHook()
#13 /var/www/production/w/includes/HookContainer/HookRunner.php(4254): MediaWiki\HookContainer\HookContainer->run()
#14 /var/www/production/w/includes/user/DefaultOptionsLookup.php(99): MediaWiki\HookContainer\HookRunner->onUserGetDefaultOptions()
#15 /var/www/production/w/includes/user/UserOptionsManager.php(494): MediaWiki\User\DefaultOptionsLookup->getDefaultOptions()
#16 /var/www/production/w/includes/user/UserOptionsManager.php(135): MediaWiki\User\UserOptionsManager->loadUserOptions()
#17 /var/www/production/w/includes/user/UserOptionsLookup.php(123): MediaWiki\User\UserOptionsManager->getOption()
#18 /var/www/production/w/includes/user/User.php(2718): MediaWiki\User\UserOptionsLookup->getIntOption()
#19 /var/www/production/w/includes/user/User.php(2910): User->getIntOption()
#20 /var/www/production/w/includes/linker/LinkRendererFactory.php(99): User->getStubThreshold()
#21 /var/www/production/w/includes/ServiceWiring.php(531): MediaWiki\Linker\LinkRendererFactory->createForUser()
#22 /var/www/production/w/vendor/wikimedia/services/src/ServiceContainer.php(447): Wikimedia\Services\ServiceContainer->{closure}()
#23 /var/www/production/w/vendor/wikimedia/services/src/ServiceContainer.php(416): Wikimedia\Services\ServiceContainer->createService()
#24 /var/www/production/w/includes/MediaWikiServices.php(834): Wikimedia\Services\ServiceContainer->getService()
#25 /var/www/production/w/includes/page/Article.php(164): MediaWiki\MediaWikiServices->getLinkRenderer()
#26 /var/www/production/w/includes/page/Article.php(211): Article->__construct()
#27 /var/www/production/w/includes/page/Article.php(227): Article::newFromTitle()
#28 /var/www/production/w/includes/MediaWiki.php(422): Article::newFromWikiPage()
#29 /var/www/production/w/includes/MediaWiki.php(311): MediaWiki->initializeArticle()
#30 /var/www/production/w/includes/MediaWiki.php(947): MediaWiki->performRequest()
#31 /var/www/production/w/includes/MediaWiki.php(547): MediaWiki->main()
#32 /var/www/production/w/index.php(53): MediaWiki->run()
#33 /var/www/production/w/index.php(46): wfIndexMain()
#34 {main}