JingGe commented on a change in pull request #18825:
URL: https://github.com/apache/flink/pull/18825#discussion_r819475475



##########
File path: 
flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/connector/kafka/sink/KafkaWriter.java
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@@ -406,6 +419,7 @@ public WriterCallback(
         @Override
         public void onCompletion(RecordMetadata metadata, Exception exception) 
{
             if (exception != null) {
+                numRecordsOutErrorsCounter.inc();

Review comment:
       The metric is useful for user to be aware of the error even if it only 
have 1. I will move the call to the mail box thread.




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