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Backtrace:

#0 /usr/share/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(758): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#1 /usr/share/mediawiki/includes/page/WikiPage.php(495): Wikimedia\Rdbms\LoadBalancer->getConnection()
#2 /usr/share/mediawiki/includes/page/WikiPage.php(608): WikiPage->loadPageData()
#3 /usr/share/mediawiki/includes/page/WikiPage.php(649): WikiPage->exists()
#4 /usr/share/mediawiki/includes/page/WikiPage.php(287): WikiPage->getContentModel()
#5 /usr/share/mediawiki/includes/page/WikiPage.php(274): WikiPage->getContentHandler()
#6 /usr/share/mediawiki/includes/actions/Action.php(98): WikiPage->getActionOverrides()
#7 /usr/share/mediawiki/includes/actions/Action.php(155): Action::factory()
#8 /usr/share/mediawiki/includes/MediaWiki.php(155): Action::getActionName()
#9 /usr/share/mediawiki/includes/MediaWiki.php(782): MediaWiki->getAction()
#10 /usr/share/mediawiki/includes/MediaWiki.php(515): MediaWiki->main()
#11 /usr/share/mediawiki/index.php(42): MediaWiki->run()
#12 {main}