title: Line numbers with logback
body: <p>I want to add line numbers (just a sequential integer that keeps incrementing on each log line) to my logback config - how do I do that? I looked through the properties available in the <a href="http://logback.qos.ch/manual/layouts.html" rel="nofollow">docs</a> but i couldn't see it anywhere. What am I missing?</p>