zentol commented on a change in pull request #16951:
URL: https://github.com/apache/flink/pull/16951#discussion_r694780164



##########
File path: 
flink-test-utils-parent/flink-connector-testing/src/main/java/org/apache/flink/connectors/test/common/environment/MiniClusterTestEnvironment.java
##########
@@ -103,6 +113,9 @@ public void startUp() throws Exception {
             return;
         }
         this.miniCluster.before();
+        this.metricReporter =
+                (InMemoryReporter)

Review comment:
       instead of this ugly cast the we could modify signature of the factory




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