AMBARI-17015 : Negative values are shown for metrics in certain Ambari widgets. (avijayan)

ambari-metrics/ambari-metrics-common/src/main/java/org/apache/hadoop/metrics2/sink/timeline/PostProcessingUtil.java

@@ -149,7 +149,10 @@ public class PostProcessingUtil {
           interpolatedValue = y1 + m * (requiredTs - timestamps[0]);
         }
       }
-      interpolatedValuesMap.put(requiredTs, interpolatedValue);
+
+      if (interpolatedValue != null && interpolatedValue >= 0.0) {
+        interpolatedValuesMap.put(requiredTs, interpolatedValue);
+      }
     }
     return interpolatedValuesMap;
   }