Neos\Media\Domain\Model\ThumbnailConfiguration::logDeprecation PHP Method

    protected function logDeprecation()
    {
        if (!static::$loggedDeprecation) {
            static::$loggedDeprecation = true;
            $this->logger->log('Neos.Media is configured to simulate the deprecated Neos 1.2 behaviour. Please check the setting "Neos.Media.behaviourFlag".', LOG_DEBUG);
        }
    }