THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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In this proposal, a "plugin" is an interface users can implement and that is instantiated by Kafka. For example, a custom class implementing org.apache.kafka.server.policy.CreateTopicPolicy is considered a plugin as it's instantiated by brokers. On the other hand a class implementing org.apache.kafka.clients.producer.Callback is not considered a plugin as it's instantiated in user logic.
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