THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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At the moment, consumer group state is already serialized as a STRING in DescribeGroupsResponse, so serializing it the same way here. ListGroupsResponse is left untouched. If State is not specified or if it's empty, all groups will be returned.
AdminClient API
To expose this feature in the AdminClient API, ListConsumerGroupsOptions will be updated.
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