title: very short-lived idle GAE instance
body: <p>I'm perfectly fine with the fact that an idle instance dies after 15 minutes or so, and need to be loaded upon next request.</p>
  
  <p>But I have an application that dies after less than 5 minutes of inactivity. 
  this increases the chances of a load_request AND makes charges me for 15 minutes.</p>
  
  <p>how can I debug this? why it dies so quickly.
  my other app dies after 15 minutes of inactivity as expected.</p>