wu-sheng commented on code in PR #404:
URL: https://github.com/apache/skywalking-java/pull/404#discussion_r1038734804


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apm-sniffer/apm-sdk-plugin/rocketMQ-4.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/rocketMQ/v4/MessageSendInterceptor.java:
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@@ -59,6 +59,15 @@ public void beforeMethod(EnhancedInstance objInst, Method 
method, Object[] allAr
         span.setComponent(ComponentsDefine.ROCKET_MQ_PRODUCER);
         Tags.MQ_BROKER.set(span, (String) allArguments[0]);
         Tags.MQ_TOPIC.set(span, message.getTopic());
+        String keys = message.getKeys();
+        if (StringUtil.isNotBlank(keys)) {
+            span.tag(Tags.ofKey("message.keys"), keys);
+        }
+        String tags = message.getTags();
+        if (StringUtil.isNotBlank(tags)) {
+            span.tag(Tags.ofKey("message.tags"), tags);
+        }

Review Comment:
   please add a prefix for tag keys. `mq.message.keys` and `mq.message.tags`. 
If they are widely known concepts in the queue ecosystem, consider moving them 
to `Tags`. If not, you don't have to.



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