title: Cloudwatch Metric showing wrong value
body: <p>I have an application publishing a custom cloudwatch metric using boto's put_metric_data. The metric shows the number of tasks waiting in a redis queue.</p>
  
  <p>The 1-minute max shows '3', 1-minute min shows '0' and 1-minute average shows '1.5'.</p>
  
  <p>It seems that the application is correctly setting the value to zero, but some other process is overwriting it with 3 at the same time, but I can't find this to stop it.</p>
  
  <p>Is it possible to see logs for PutMetricData to diagnose where this value might be coming from?</p>