diff --git a/java/src/main/java/monasca/persister/repository/InfluxV8MetricRepo.java b/java/src/main/java/monasca/persister/repository/InfluxV8MetricRepo.java
index 82714f41..c6fe5fde 100644
--- a/java/src/main/java/monasca/persister/repository/InfluxV8MetricRepo.java
+++ b/java/src/main/java/monasca/persister/repository/InfluxV8MetricRepo.java
@@ -17,9 +17,10 @@
 
 package monasca.persister.repository;
 
+import com.google.inject.Inject;
+
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-import com.google.inject.Inject;
 
 import org.influxdb.dto.Serie;
 import org.slf4j.Logger;
@@ -94,7 +95,7 @@ public class InfluxV8MetricRepo extends InfluxMetricRepo
           logger.debug("Added column value to colValsObjArry[{}] = {}", 2, valueMetaJson);
           }
           catch (JsonProcessingException e) {
-            logger.error("Unable to serialize " + measurement.valueMeta, e);
+            logger.error("Unable to serialize value meta data {}", measurement.valueMeta, e);
           }
         }
         builder.values(colValsObjArry);
diff --git a/java/src/main/java/monasca/persister/repository/InfluxV9MetricRepo.java b/java/src/main/java/monasca/persister/repository/InfluxV9MetricRepo.java
index 00f33640..73e1dd37 100644
--- a/java/src/main/java/monasca/persister/repository/InfluxV9MetricRepo.java
+++ b/java/src/main/java/monasca/persister/repository/InfluxV9MetricRepo.java
@@ -18,11 +18,11 @@
 
 package monasca.persister.repository;
 
+import com.google.inject.Inject;
+
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 
-import com.google.inject.Inject;
-
 import org.joda.time.DateTime;
 import org.joda.time.DateTimeZone;
 import org.joda.time.format.DateTimeFormatter;
@@ -84,8 +84,8 @@ public class InfluxV9MetricRepo extends InfluxMetricRepo {
       for (Dim dim : dimSet) {
         tagMap.put(dim.name, dim.value);
       }
-      tagMap.put("tenant_id", def.tenantId);
-      tagMap.put("region", def.region);
+      tagMap.put("_tenant_id", def.tenantId);
+      tagMap.put("_region", def.region);
 
       for (final Measurement measurement : this.measurementMap.get(defDimId)) {