mattrpav commented on code in PR #1329:
URL: https://github.com/apache/activemq/pull/1329#discussion_r1884326507


##########
activemq-broker/src/main/java/org/apache/activemq/broker/region/DestinationStatistics.java:
##########
@@ -76,6 +87,17 @@ public DestinationStatistics() {
         networkEnqueues = new CountStatisticImpl("networkEnqueues", "The 
number of messages that have been sent to the destination via network 
connection");
         networkDequeues = new CountStatisticImpl("networkDequeues", "The 
number of messages that have been acknowledged from the destination via network 
connection");
 
+        enqueuedMessageBrokerInTime = new 
UnsampledStatisticImpl<>("enqueuedMessageBrokerInTime", "ms", "Broker in time 
(ms) of last enqueued message to the destination", Long.valueOf(0l));
+        enqueuedMessageClientID = new 
UnsampledStatisticImpl<>("enqueuedMessageClientID", "id", "ClientID of last 
enqueued message to the destination", null);
+        enqueuedMessageID = new UnsampledStatisticImpl<>("enqueuedMessageID", 
"id", "MessageID of last enqueued message to the destination", null);
+        enqueuedMessageTimestamp = new 
UnsampledStatisticImpl<>("enqueuedMessageTimestamp", "ms", "Message timestamp 
of last enqueued message to the destination", Long.valueOf(0l));
+
+        dequeuedMessageBrokerInTime = new 
UnsampledStatisticImpl<>("dequeuedMessageBrokerInTime", "ms", "Broker in time 
(ms) of last dequeued message to the destination", Long.valueOf(0l));

Review Comment:
   Using a wrapper object for MessageFlowStatistics to support enable/disable 
and not require memory allocation for unused metrics



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