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(Cannot access the database)

Backtrace:

#0 /app/includes/libs/rdbms/loadbalancer/LoadBalancer.php(972): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#1 /app/includes/libs/rdbms/loadbalancer/LoadBalancer.php(944): Wikimedia\Rdbms\LoadBalancer->getServerConnection()
#2 /app/includes/libs/rdbms/database/DBConnRef.php(95): Wikimedia\Rdbms\LoadBalancer->getConnectionInternal()
#3 /app/includes/libs/rdbms/database/DBConnRef.php(101): Wikimedia\Rdbms\DBConnRef->ensureConnection()
#4 /app/includes/libs/rdbms/database/DBConnRef.php(516): Wikimedia\Rdbms\DBConnRef->__call()
#5 /app/includes/language/MessageCache.php(574): Wikimedia\Rdbms\DBConnRef->anyString()
#6 /app/includes/language/MessageCache.php(481): MessageCache->loadFromDB()
#7 /app/includes/language/MessageCache.php(398): MessageCache->loadFromDBWithMainLock()
#8 /app/includes/language/MessageCache.php(318): MessageCache->loadUnguarded()
#9 /app/includes/language/MessageCache.php(1213): MessageCache->load()
#10 /app/includes/language/MessageCache.php(1126): MessageCache->getMsgFromNamespace()
#11 /app/includes/language/MessageCache.php(1097): MessageCache->getMessageForLang()
#12 /app/includes/language/MessageCache.php(1039): MessageCache->getMessageFromFallbackChain()
#13 /app/includes/language/Message.php(1473): MessageCache->get()
#14 /app/includes/language/Message.php(1122): Message->fetchMessage()
#15 /app/extensions/CirrusSearch/includes/Hooks.php(204): Message->isDisabled()
#16 /app/includes/libs/objectcache/BagOStuff.php(216): CirrusSearch\Hooks::CirrusSearch\{closure}()
#17 /app/extensions/CirrusSearch/includes/Hooks.php(208): BagOStuff->getWithSetCallback()
#18 /app/extensions/CirrusSearch/includes/Hooks.php(104): CirrusSearch\Hooks::overrideMoreLikeThisOptionsFromMessage()
#19 /app/extensions/CirrusSearch/includes/Hooks.php(76): CirrusSearch\Hooks::initializeForRequest()
#20 /app/includes/HookContainer/HookContainer.php(338): CirrusSearch\Hooks::onBeforeInitialize()
#21 /app/includes/HookContainer/HookContainer.php(137): MediaWiki\HookContainer\HookContainer->callLegacyHook()
#22 /app/includes/HookContainer/HookRunner.php(938): MediaWiki\HookContainer\HookContainer->run()
#23 /app/includes/MediaWiki.php(208): MediaWiki\HookContainer\HookRunner->onBeforeInitialize()
#24 /app/includes/MediaWiki.php(904): MediaWiki->performRequest()
#25 /app/includes/MediaWiki.php(562): MediaWiki->main()
#26 /app/index.php(50): MediaWiki->run()
#27 /app/index.php(46): wfIndexMain()
#28 {main}