Ensure histogram sum is correct.

polotek · Jun 20, 2011 · bbe9313 · bbe9313
1 parent 820c6a7
commit bbe9313
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/metrics/histogram.js b/metrics/histogram.js
@@ -42,7 +42,7 @@ Histogram.prototype.update = function(val, timestamp) {
   } else {
     this.min = val < this.min ? val : this.min;
   }
-  this.sum += val;
+  this.sum = (this.sum === null) ? val : this.sum + val;
   this.updateVariance(val);
 }