title: GoCD - Notification for GoAgent status changes(missing/lost contact)
body: <p>I am using <code>GoCD</code> for the automated deployment of our application. I am facing an <code>serious issue</code>, that is if any agent <code>lost contact/missing</code> - its corresponding <code>pipeline</code> just <code>hangs</code>. </p>
  
  <p>There is no notification sent about the unavailability of the agent or pipeline is not getting failed. </p>
  
  <p>Can anyone suggest if there is anyway to fix this issue with <code>GoCD</code> or any <code>plugins</code> that can be used to get notifications on <code>GoAgent</code> machine status?</p>