THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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This POC provide the new metric group scope and common metric names for the OperatorCoordinator. And It provides the internal implementation for the OperatorCoordinatorMetricGroup and SplitEnumeratorMetricGroup. Besides these, the POC modify SourceCoordinator and KafkaSourceEnumerator to show how to use the metric group.
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