title: Grafana renders data incorrectly for the last minute
body: <p>I work as a NOC operator and monitor performance of an Amazon Cloud Application. Ops team uses Graphite to monitor its health and Grafana on top of it to render fancy graphs. By design "graphite" collects data every minute
  But I've encountered an issue with Grafana, it renders incorrect data (or not fully collected, see a screenshot below) for the last minute. 
  Can I fix it?</p>
  
  <p><a href="http://i.stack.imgur.com/1xXCK.png" rel="nofollow">http://i.stack.imgur.com/1xXCK.png</a></p>