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When a Kafka Streams application is started, and then is killed unable to connect (for example, the docker container is deleteddocker daemon for instance is killed), then the user does not have an easy way of identifying the current state of Kafka Streams (i.e. does not know whether or not its DEAD or some other state). For users who wish to know the status of their application, they would have to use alternative means of performing a health check. This KIP works to resolve this issue by adding a DISCONNECTED state to KafkaStreams#state().

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