title: graphite summarize datapoints
body: <p>I'm using <a href="http://graphite.wikidot.com/" rel="noreferrer">graphite</a> to collect data, and I'd like to retrieve the total count of certain events over a period of time. Say, number of logins per week.</p>
  
  <p>However, I just need the total number, and don't need to see how it evolves over time.</p>
  
  <p>When I use something like <code>from=-1w&amp;target=summarize(stats.events.login.success,"1w")&amp;format=json</code> then I still get <strong><em>two</em></strong> datapoints, and not one.</p>
  
  <p>Is there a way to get <strong>a single datapoint</strong> from the <code>summarize</code> function? or use a different function to return a single datapoint value?</p>