title: How to profile number of goroutines
body: <p>Basically I want to find if my program is leaking goroutines over time. So 
  I want to see how many goroutines are running over time. Is there any way to do this through <code>pprof</code>?</p>
  
  <p>I've done <code>go tool pprof http://localhost:8888/debug/pprof/block</code>. </p>
  
  <p>Which gives me how long is being spent blocked but not how many routines are running.</p>