If you're using clojure.tools.logging with SLF4J.
It's often useful to 'switch on' logging for a given web request, or during the evaluation of a given form, etc.
Add this to your logback.xml configuration:
<turboFilter class="ch.qos.logback.classic.turbo.MDCFilter">
<MDCKey>logging</MDCKey>
<Value>on</Value>