title: How to send alerts based on Kubernetes / Docker events?
body: <p>Is it possible to somehow send alerts (to email / slack) based on events that occur within a Kubernetes cluster?</p>
  
  <p>In particular, it would be useful to get an alert if a pod has restarted unexpectedly or if a pod cannot start. Similarly it would be useful to know if a pod's CPU usage was over a certain threshold and get an alert.</p>
  
  <p>We have Heapster (with InfluxDB / Grafana backend) installed. While this gives useful data, it unfortunately does not provide us with alerting.</p>