Check if the logger is configured as trace when logging as trace

Change-Id: I58738913b18198fe8a01b313e776e20c6a21f1d0

@@ -575,6 +575,7 @@ public class SimpleGroupStore
         Set<Group> extraneousStoredEntries =
                 Sets.newHashSet(getExtraneousGroups(deviceId));
 
+        if (log.isTraceEnabled()) {
             log.trace("pushGroupMetrics: Displaying all ({}) "
                             + "southboundGroupEntries for device {}",
                     southboundGroupEntries.size(),
@@ -589,6 +590,7 @@ public class SimpleGroupStore
             for (Group group : storedGroupEntries) {
                 log.trace("Stored Group {} for device {}", group, deviceId);
             }
+        }
 
         for (Iterator<Group> it2 = southboundGroupEntries.iterator(); it2.hasNext();) {
             Group group = it2.next();

@@ -1243,6 +1243,7 @@ public class DistributedGroupStore
         Set<Group> extraneousStoredEntries =
                 Sets.newHashSet(getExtraneousGroups(deviceId));
 
+        if (log.isTraceEnabled()) {
             log.trace("pushGroupMetrics: Displaying all ({}) southboundGroupEntries for device {}",
                     southboundGroupEntries.size(),
                     deviceId);
@@ -1256,6 +1257,7 @@ public class DistributedGroupStore
             for (StoredGroupEntry group : storedGroupEntries) {
                 log.trace("Stored Group {} for device {}", group, deviceId);
             }
+        }
 
         garbageCollect(deviceId, southboundGroupEntries, storedGroupEntries);