snleee commented on a change in pull request #7368:
URL: https://github.com/apache/pinot/pull/7368#discussion_r719081206



##########
File path: 
pinot-plugins/pinot-minion-tasks/pinot-minion-builtin-tasks/src/main/java/org/apache/pinot/plugin/minion/tasks/mergerollup/MergeRollupTaskGenerator.java
##########
@@ -339,6 +351,21 @@ public String getTaskType() {
           .info("Finished generating task configs for table: {} for task: {}, 
numTasks: {}", offlineTableName, taskType,
               pinotTaskConfigsForTable.size());
     }
+
+    // Reset watermarks for invalid tables. This covers the metrics clean up 
when the table is removed or the merge
+    // config is added and then removed.
+    LeadControllerManager leadControllerManager = 
_clusterInfoAccessor.getLeaderControllerManager();

Review comment:
       @mqliang I changed the logic and put `cleanUpMetrics()` function. Can 
you take a look again?




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