Member MessageIndex::singleton (): Since 2020.10 Use Services::getMessageIndex()
Member MessageIndexRebuildJob::insertIntoJobQueue (): Just push directly to the job queue
Member TTMServer::factory (array $config): Use Services::getInstance()->getTtmServerFactory()->create()
Member TTMServer::primary (): Use Services::getInstance()->getTtmServerFactory()->getDefault()
Member WritableTTMServer::isFrozen (): since 2022.04