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• KafkaStreams#metrics() includes all the metrics from its embedded clients, and are organized by MetricName's group (producer, consumer, admin) and tags (clientIds); knowing the clientIds helps to quickly find the corresponding metric from the map.
• When some of the threads have failed due to unexpected error, their embedded clients may also shutdown and be notifying the users; knowing the ids helps with such trouble shooting scenarios.
• Correlated to KIP-345, exposing the consumer client's id is useful for managing static consumer members in operations like scale-in.
• etc.

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