Seen on beta after the merge of https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CommunityConfiguration/+/1131956:
Too few arguments to function MediaWiki\Extension\CommunityConfiguration\Validation\JsonSchemaValidator::__construct(), 2 passed in /srv/mediawiki/php-master/extensions/ReportIncident/src/Config/ReportIncidentConfigValidator.php on line 45 and exactly 3 expected
from /srv/mediawiki/php-master/extensions/CommunityConfiguration/src/Validation/JsonSchemaValidator.php(29)
#0 /srv/mediawiki/php-master/extensions/ReportIncident/src/Config/ReportIncidentConfigValidator.php(45): MediaWiki\Extension\CommunityConfiguration\Validation\JsonSchemaValidator->__construct(string, Wikimedia\Stats\BufferingStatsdDataFactory)
#1 /srv/mediawiki/php-master/vendor/wikimedia/object-factory/src/ObjectFactory.php(227): MediaWiki\Extension\ReportIncident\Config\ReportIncidentConfigValidator::factory(MediaWiki\Title\TitleParser, MediaWiki\Page\PageStore, Wikimedia\Stats\BufferingStatsdDataFactory, string)
#2 /srv/mediawiki/php-master/vendor/wikimedia/object-factory/src/ObjectFactory.php(149): Wikimedia\ObjectFactory\ObjectFactory::getObjectFromSpec(array, array)
#3 /srv/mediawiki/php-master/extensions/CommunityConfiguration/src/Validation/ValidatorFactory.php(73): Wikimedia\ObjectFactory\ObjectFactory->createObject(array, array)
#4 /srv/mediawiki/php-master/extensions/CommunityConfiguration/src/Provider/ConfigurationProviderFactory.php(138): MediaWiki\Extension\CommunityConfiguration\Validation\ValidatorFactory->newValidator(string, string, array)
#5 /srv/mediawiki/php-master/extensions/CommunityConfiguration/src/Provider/ConfigurationProviderFactory.php(165): MediaWiki\Extension\CommunityConfiguration\Provider\ConfigurationProviderFactory->constructProvider(string)
#6 /srv/mediawiki/php-master/extensions/CommunityConfiguration/src/Access/MediaWikiConfigReader.php(60): MediaWiki\Extension\CommunityConfiguration\Provider\ConfigurationProviderFactory->newProvider(string)
#7 /srv/mediawiki/php-master/extensions/CommunityConfiguration/src/Access/MediaWikiConfigReader.php(89): MediaWiki\Extension\CommunityConfiguration\Access\MediaWikiConfigReader->computeVariableToProviderMap()
#8 /srv/mediawiki/php-master/includes/libs/objectcache/BagOStuff.php(266): MediaWiki\Extension\CommunityConfiguration\Access\MediaWikiConfigReader->MediaWiki\Extension\CommunityConfiguration\Access\{closure}(int)
#9 /srv/mediawiki/php-master/extensions/CommunityConfiguration/src/Access/MediaWikiConfigReader.php(90): Wikimedia\ObjectCache\BagOStuff->getWithSetCallback(string, int, Closure)
#10 /srv/mediawiki/php-master/extensions/CommunityConfiguration/src/Access/MediaWikiConfigReader.php(139): MediaWiki\Extension\CommunityConfiguration\Access\MediaWikiConfigReader->getVariableToProviderMap()
#11 /srv/mediawiki/php-master/extensions/CommunityConfiguration/src/Access/MediaWikiConfigRouter.php(25): MediaWiki\Extension\CommunityConfiguration\Access\MediaWikiConfigReader->has(string)
#12 /srv/mediawiki/php-master/extensions/GrowthExperiments/includes/Config/MediaWikiConfigReaderWrapper.php(39): MediaWiki\Extension\CommunityConfiguration\Access\MediaWikiConfigRouter->get(string)
#13 /srv/mediawiki/php-master/extensions/GrowthExperiments/includes/Mentorship/Hooks/MentorHooks.php(289): GrowthExperiments\Config\MediaWikiConfigReaderWrapper->get(string)
#14 /srv/mediawiki/php-master/includes/HookContainer/HookContainer.php(155): GrowthExperiments\Mentorship\Hooks\MentorHooks->onUserGetRights(MediaWiki\User\User, array)
#15 /srv/mediawiki/php-master/includes/HookContainer/HookRunner.php(4364): MediaWiki\HookContainer\HookContainer->run(string, array)
#16 /srv/mediawiki/php-master/includes/Permissions/PermissionManager.php(1591): MediaWiki\HookContainer\HookRunner->onUserGetRights(MediaWiki\User\User, array)
#17 /srv/mediawiki/php-master/includes/Permissions/PermissionManager.php(1539): MediaWiki\Permissions\PermissionManager->getUserPermissions(MediaWiki\User\User)
#18 /srv/mediawiki/php-master/includes/Permissions/PermissionManager.php(1088): MediaWiki\Permissions\PermissionManager->userHasRight(MediaWiki\User\User, string)
#19 /srv/mediawiki/php-master/includes/Permissions/PermissionManager.php(533): MediaWiki\Permissions\PermissionManager->checkQuickPermissions(string, MediaWiki\User\User, MediaWiki\Permissions\PermissionStatus, string, bool, MediaWiki\Title\Title)
#20 /srv/mediawiki/php-master/includes/Permissions/PermissionManager.php(291): MediaWiki\Permissions\PermissionManager->getPermissionStatus(string, MediaWiki\User\User, MediaWiki\Title\Title, string, bool)
#21 /srv/mediawiki/php-master/includes/Permissions/UserAuthority.php(381): MediaWiki\Permissions\PermissionManager->userCan(string, MediaWiki\User\User, MediaWiki\Title\Title, string)
#22 /srv/mediawiki/php-master/includes/Permissions/UserAuthority.php(176): MediaWiki\Permissions\UserAuthority->internalCan(string, string, MediaWiki\Title\Title, null, bool)
#23 /srv/mediawiki/php-master/includes/user/User.php(3296): MediaWiki\Permissions\UserAuthority->probablyCan(string, MediaWiki\Title\Title, null)
#24 /srv/mediawiki/php-master/includes/page/Article.php(524): MediaWiki\User\User->probablyCan(string, MediaWiki\Title\Title)
#25 /srv/mediawiki/php-master/includes/actions/ViewAction.php(80): MediaWiki\Page\Article->view()
#26 /srv/mediawiki/php-master/includes/actions/ActionEntryPoint.php(728): MediaWiki\Actions\ViewAction->show()
#27 /srv/mediawiki/php-master/includes/actions/ActionEntryPoint.php(505): MediaWiki\Actions\ActionEntryPoint->performAction(MediaWiki\Page\Article, MediaWiki\Title\Title)
#28 /srv/mediawiki/php-master/includes/actions/ActionEntryPoint.php(143): MediaWiki\Actions\ActionEntryPoint->performRequest()
#29 /srv/mediawiki/php-master/includes/MediaWikiEntryPoint.php(202): MediaWiki\Actions\ActionEntryPoint->execute()
#30 /srv/mediawiki/php-master/index.php(58): MediaWiki\MediaWikiEntryPoint->run()
#31 /srv/mediawiki/w/index.php(3): require(string)
#32 {main}