title: Notifications in openstack
body: <p>I'm interested how to notify other applications of events in openstack. For example I want't to know in my application when an instance in nova was suspended or resumed. Are there any webhooks or something like that where could I get that info?</p>
  
  <p>I was looking at official documentation on notification but I can't really make anything out of that:
  <a href="http://docs.openstack.org/trunk/openstack-network/admin/content/ch_adv_notification_overview.html" rel="nofollow">http://docs.openstack.org/trunk/openstack-network/admin/content/ch_adv_notification_overview.html</a></p>
  
  <p>I could not find any examples with code on the web too. </p>
  
  <p>Has anyone been doing anything like this yet?</p>