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(Cannot access the database: Too many connections (127.0.0.1))

Backtrace:

#0 /var/www/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(1134): Wikimedia\Rdbms\Database->reportConnectionError('Too many connec...')
#1 /var/www/mediawiki/includes/libs/rdbms/loadbalancer/LoadBalancer.php(749): Wikimedia\Rdbms\LoadBalancer->reportConnectionError()
#2 /var/www/mediawiki/includes/GlobalFunctions.php(2801): Wikimedia\Rdbms\LoadBalancer->getConnection(0, Array, false)
#3 /var/www/mediawiki/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(96): wfGetDB(-1)
#4 /var/www/mediawiki/includes/libs/objectcache/WANObjectCache.php(1240): MediaWikiGadgetsDefinitionRepo->{closure}(false, 86400, Array, NULL)
#5 /var/www/mediawiki/includes/libs/objectcache/WANObjectCache.php(1114): WANObjectCache->doGetWithSetCallback('mediawikidb:gad...', 86400, Object(Closure), Array)
#6 /var/www/mediawiki/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(106): WANObjectCache->getWithSetCallback('mediawikidb:gad...', 86400, Object(Closure), Array)
#7 /var/www/mediawiki/extensions/Gadgets/includes/MediaWikiGadgetsDefinitionRepo.php(31): MediaWikiGadgetsDefinitionRepo->loadGadgets()
#8 /var/www/mediawiki/extensions/Gadgets/includes/GadgetRepo.php(71): MediaWikiGadgetsDefinitionRepo->getGadgetIds()
#9 /var/www/mediawiki/extensions/Gadgets/includes/GadgetHooks.php(47): GadgetRepo->getStructuredList()
#10 /var/www/mediawiki/includes/Hooks.php(177): GadgetHooks::userGetDefaultOptions(Array)
#11 /var/www/mediawiki/includes/Hooks.php(205): Hooks::callHook('UserGetDefaultO...', Array, Array, NULL)
#12 /var/www/mediawiki/includes/user/User.php(1751): Hooks::run('UserGetDefaultO...', Array)
#13 /var/www/mediawiki/includes/user/User.php(5438): User::getDefaultOptions()
#14 /var/www/mediawiki/includes/user/User.php(3095): User->loadOptions()
#15 /var/www/mediawiki/includes/context/RequestContext.php(391): User->getOption('skin')
#16 /var/www/mediawiki/includes/context/ContextSource.php(137): RequestContext->getSkin()
#17 /var/www/mediawiki/skins/MinervaNeue/includes/MinervaHooks.php(122): ContextSource->getSkin()
#18 /var/www/mediawiki/includes/Hooks.php(177): MinervaHooks::onSpecialPageBeforeExecute(Object(SpecialBookSources), '978-0-520-29549...')
#19 /var/www/mediawiki/includes/Hooks.php(205): Hooks::callHook('SpecialPageBefo...', Array, Array, NULL)
#20 /var/www/mediawiki/includes/specialpage/SpecialPage.php(515): Hooks::run('SpecialPageBefo...', Array)
#21 /var/www/mediawiki/includes/specialpage/SpecialPageFactory.php(568): SpecialPage->run('978-0-520-29549...')
#22 /var/www/mediawiki/includes/MediaWiki.php(288): SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
#23 /var/www/mediawiki/includes/MediaWiki.php(861): MediaWiki->performRequest()
#24 /var/www/mediawiki/includes/MediaWiki.php(524): MediaWiki->main()
#25 /var/www/mediawiki/index.php(42): MediaWiki->run()
#26 {main}

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