title: Graphite historical data merge
body: <p>I have <strong>Carbon Aggregator</strong> and <strong>whisper</strong> in my <strong>Graphite</strong> setup, seems to be working well.</p>
  
  <p>I have a situation where part of my data can be stale, and so it will be <strong>replaced</strong> (NOT aggregated) with the data already recorded for that historical period of time. How to handle that situation in Graphite if I want it to be <strong>aggregated</strong> (summed/averaged) not replaced.</p>
  
  <p>It seems like if you have 1 hour of metric's aggregated value just committed to whisper and new data which just arrived, it spoils all the data for previous hour???</p>