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But Kafka Streams is in a unique position, as it is a client application itself.  As a consequence, there is some potential tension with different metrics enablement patterns between Kafka Streams and its internal clients. Below is a table of configuration possibilities:

Metrics enabledKafka Streams config actionClient config action
Kafka Streams = yes, clients = yesNothing, enabled by defaultNothing, enabled by default
Kafka Streams = no, clients = yes

ENABLE_METRICS_PUSH_CONFIG = false 

main.consumer.ENABLE_METRICS_PUSH_CONFIG = true 

producer.ENABLE_METRICS_PUSH_CONFIG = true 

It's important to note that since Kafka Streams leverages the client metrics mechanism, disabling metrics for internal clients removes the possibility of pushing Kafka Streams metrics.  In practice, this is not an anticipated scenario, but in the interest of completeness, it's worth specifying it here in the KIP.

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