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Current Kafka authorizer plugin cannot access to Kafka broker metrics information.  Kafka authorizer plugins need access to runtime broker Metrics instance to add additional metrics.  There is disconnection for between how to manage Metrics between broker and authorizer plugins in current Kafka implementation. The authorizer plugins as plugins of broker could use same Metrics instance in broker, so authorizer plugins need not manage tasks like creating and configuring Metrics and JmxReporter. With the feature of this KIP, authorizer plugin can use broker's Metrics instance to add additional metrics very easy.

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