title: Getting a true 95th percentile in DataDog
body: <p>I have an application that publishes a metric to DataDog with multiple tags, and my DataDog agent has a line that looks like</p>
  
  <pre><code>histogram_percentiles: 90, 95, 99
  </code></pre>
  
  <p>So my metric (lets call it <code>ResponseTime</code>) has a metric in the DataDog viewer for each of those (i.e. <code>ResponseTime.90perentile</code>).</p>
  
  <p>However if you look at this metric carefully it appears to be calculating these percentiles on a short range (not sure what) and for each tuple of the tags that exist.</p>
  
  <p>Ideally what I'd like to get is a 95th percentile of the <code>ResponseTime</code> metric over all the tags (maybe I filter it down by 1 or 2 and have a couple of different graphs) but over the last week or so.  Is there an easy way to do this?</p>