title: AppDynamics or NewRelic kind of system - how does it work?
body: <p>How do you build a AppDynamic or New Relic kind of system that collects performance metrics of your application including detailed call tree stats by merely installing a software on the servers where your application runs? </p>
  
  <p>Is it even possible to collect such metrics without compiling your apps with debug information? </p>
  
  <p>What are the performance trade offs to consider when building such a service? How do such software minimize the performance impact they themselves might be having on the application.</p>