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On client side, we add a new config called `group.instance.id` in ConsumerConfig and DistributedConfig (config class for Connect). On consumer service init, if the `group.instance.id` config is set, we will put it in the initial join group request to identify itself as a static member. Note that it is user's responsibility to assign unique `group.instance.id` for each consumers. This could be in service discovery hostname, unique IP address, etc. We also have logic handling duplicate `group.instance.id` in case client configuration contains duplicates.

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