imaffe commented on a change in pull request #18816:
URL: https://github.com/apache/flink/pull/18816#discussion_r840379481



##########
File path: 
flink-metrics/flink-metrics-core/src/main/java/org/apache/flink/metrics/groups/UnregisteredMetricsGroup.java
##########
@@ -178,4 +182,35 @@ public T getValue() {
             return null;
         }
     }
+
+    private static class UnregisteredSinkWriterMetricGroup extends 
UnregisteredMetricsGroup

Review comment:
       Because I didn't find a good way to mock SinkWriterMetricGroup, and I 
saw there are other UnregisterdXXXMetricGroup() used in Sink




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