PatrickRen commented on code in PR #21065:
URL: https://github.com/apache/flink/pull/21065#discussion_r997906032


##########
flink-connectors/flink-connector-aws-kinesis-firehose/src/main/java/org/apache/flink/connector/firehose/sink/KinesisFirehoseSinkWriter.java:
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@@ -96,11 +96,7 @@ private static FirehoseAsyncClient createFirehoseClient(
                     RESOURCE_NOT_FOUND_EXCEPTION_CLASSIFIER,
                     getSdkClientMisconfiguredExceptionClassifier());
 
-    // deprecated, use numRecordsSendErrorsCounter instead.
-    @Deprecated private final Counter numRecordsOutErrorsCounter;
-
-    /* A counter for the total number of records that have encountered an 
error during put */
-    private final Counter numRecordsSendErrorsCounter;

Review Comment:
   `numRecordsSend` and `numRecordsSendErrors` are registered in 
`InternalSinkWriterMetricGroup` using the same counter of `numRecordsOut` and 
`numRecordsOutErrors`, in order to make these metrics having the same value. 
Thus we only need to keep one counter in the sink writer implementation. 



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