* comment: Interval (seconds) for system monitor during crawling.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getCrawlerSystemMonitorInterval();

    /**
     * Get the value for the key 'crawler.system.monitor.interval' as {@link Integer}. <br>
     * The value is, e.g. 60 <br>