Removing a comment from the util file

src/main/java/com/amazon/opendistro/elasticsearch/performanceanalyzer/rca/store/rca/cache/CacheUtil.java

@@ -14,8 +14,7 @@ public class CacheUtil {
     public static Double getTotalSizeInMB(final Metric sizeMetric) {
         double sizeTotalInMB = 0;
 
-        // we expect the Metric to have single flow unit
-        // TODO: Depending on Ruizhen's comment
+        // we expect the Metric to have single flow unit since it is consumed locally
         MetricFlowUnit flowUnit = sizeMetric.getFlowUnits().get(0);
         if (flowUnit.isEmpty() || flowUnit.getData() == null) {
             return sizeTotalInMB;