ensure that AspectJ is properly configured within SBT

The Aspectj configuration in your build was partially ok, most notably the following changes were necessary:
  - include `fork in run := true` setting in Aspectj settings, this part is really important because if you don't fork the JVM then the weaver will not attach to it and thus, no Kamon magic will happen.
  - include the aspectj settings in the `myEngine` project.
  - also subscribed you to TraceMetrics and set the tick-interval to 10 seconds, just to avoid having too much output while testing :).