ATLAS-1583: fix incorrect metrics by import API

repository/src/main/java/org/apache/atlas/repository/store/graph/v1/AtlasEntityStoreV1.java

@@ -186,6 +186,10 @@ public class AtlasEntityStoreV1 implements AtlasEntityStore {
         }
 
         for (AtlasEntityHeader h : list) {
+            if(processedGuids.contains(h.getGuid())) {
+                continue;
+            }
+
             processedGuids.add(h.getGuid());
             importResult.incrementMeticsCounter(String.format(prefix, h.getTypeName()));
         }

webapp/src/main/java/org/apache/atlas/web/resources/ImportService.java

@@ -139,6 +139,6 @@ public class ImportService {
         this.entityStore.bulkImport(importSource, result);
 
         endTimestamp = System.currentTimeMillis();
-        result.incrementMeticsCounter("Duration", (int) (this.endTimestamp - this.startTimestamp));
+        result.incrementMeticsCounter("duration", (int) (this.endTimestamp - this.startTimestamp));
     }
 }