* The value is, e.g. true <br>
     * comment: Whether the thumbnail crawler is enabled.
     * @return The determination, true or false. (if not found, exception but basically no way)
     */
    boolean isThumbnailCrawlerEnabled();

    /**
     * Get the value for the key 'thumbnail.system.monitor.interval'. <br>
     * The value is, e.g. 60 <br>
     * comment: Interval for system monitor in thumbnail processing.