Hi, we often need to change log level thresholds to investigate a problem in a running system. Right now, we do that by using <configuration scan="true" scanPeriod="30 seconds"> and then editing the logback.xml file by hand (i.e. using a text editor or Sed or Perl). I wonder if there is a better way to accomplish this. I know that we can e.g. use <root level="${rootLevel}"/> but what I do not yet understand is: 1. Can I modify the value if this variable via some Java API from within my application? 2. Do we still need the scan="true" attribute or will the "rootLevel" variable be evaluated every time the logger is used? 3. Is there a measurable performance impact by using variables in that manner? </nk> --- [MetricStream]<http://www.metricstream.com/> Norbert Kiesel | Chief Architect [https://assets.metricstream.com/lp/email-signature-mail-icon-grey.png] nkiesel@metricstream.com<mailto:nkiesel@metricstream.com> [https://assets.metricstream.com/lp/email-signature-mobile-icon-grey.png] +1-650-620-2955 [https://assets.metricstream.com/lp/email-signature-phone-icon-grey.png] +1-650-620-2955 www.metricstream.com<https://www.metricstream.com/> [Linkedin]<https://www.linkedin.com/company/metricstream> [Facebook] <https://twitter.com/metricstream> [Twitter] <https://www.facebook.com/MetricStream> [youtube] <https://www.youtube.com/user/MetricStream> [https://assets.metricstream.com/lp/meticstream-email-signature-stream-bg.png]