title: Akka actor tracing in not working in Kamon
body: <p>I would like to get Akka actor tracing metrics in a Java application.
  I enabled tracing in my <strong>application.conf</strong> but I get no tracing metrics.
  This topic is way underdocumented.
  The Kamon documentation says:</p>
  
  <p>"Please note that even while understanding how to manipulate a TraceContext is very important, some Kamon modules such as our <strong>Akka</strong>, Scala, Spray and Play! modules already provide bytecode instrumentation that automatically creates, propagates and finishes traces and segments in specific conditions, so, you might not need to ever manipulate a TraceContext yourself."  </p>
  
  <p>From this I understand that all I have to do is to enable tracing in the configuration file and I should get tracing metrics.<br>
  I tried to create a trace context <strong>in Java code</strong> and called <code>finish()</code> on it and <strong>I get trace metrics</strong>. </p>
  
  <p>I send data through several actors and I would also be interested in getting some information (for example total processing time; identification of data based on some kind of tagging) when a concrete piece of data arrives to the last actor. I wonder if this can be done from configuration. </p>
  
  <p>Thank you!</p>