* The value is, e.g. 60 <br>
     * 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>

- github.com/ianlancetaylor/demangle: [5e5cf60](https://github.com/ianlancetaylor/demangle/tree/5e5cf60)
- github.com/rogpeppe/go-internal: [v1.3.0](https://github.com/rogpeppe/go-internal/tree/v1.3.0)
- github.com/russross/blackfriday/v2: [v2.0.1](https://github.com/russross/blackfriday/v2/tree/v2.0.1)

#{$rfs-breakpoint}px, #{divide($rfs-breakpoint, $rfs-rem-value)}#{$rfs-breakpoint-unit});\n$rfs-mq-property-width: if($rfs-mode == max-media-query, max-width, min-width);\n$rfs-mq-property-height: if($rfs-mode == max-media-query, max-height, min-height);\n\n// Internal mixin used to determine which media query needs to be used\n@mixin _rfs-media-query {\n  @if $rfs-two-dimensional {\n    @if $rfs-mode == max-media-query {\n      @media (#{$rfs-mq-property-width}: #{$rfs-mq-value}), (#{$rfs-mq-property-height}:...

&,\n    &.disable-responsive-font-size {\n      @content;\n    }\n  }\n  @else {\n    @content;\n  }\n}\n\n// Internal mixin that adds enable classes to the selector if needed.\n@mixin _rfs-enable-class {\n  @if $rfs-class == \"enable\" {\n    .enable-responsive-font-size &,\n    &.enable-responsive-font-size {\n      @content;\n    }\n  }\n  @else {\n    @content;\n  }\n}\n\n// Internal mixin used to determine which media query needs to be used\n@mixin _rfs-media-query($mq-value) {\n  @if $rfs-two-dimensional...