wu-sheng commented on a change in pull request #8193:
URL: https://github.com/apache/skywalking/pull/8193#discussion_r757837607



##########
File path: 
oap-server/server-receiver-plugin/envoy-metrics-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/envoy/AccessLogServiceGRPCHandler.java
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@@ -105,7 +110,7 @@ public AccessLogServiceGRPCHandler(ModuleManager manager,
             public void onNext(StreamAccessLogsMessage message) {
                 HistogramMetrics.Timer timer = histogram.createTimer();
                 try {
-                    if (isFirst) {
+                    if (isFirst || (alwaysAnalyzeIdentity && 
message.getIdentifier() != null)) {

Review comment:
       >   // Identifier data that will only be sent in the first message on 
the stream. This is effectively
     // structured metadata and is a performance optimization.
     Identifier identifier = 1;
   
   This is from ALS definition. What do you mean `never null`?




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