@brief Returns this client's broker-assigned group member id
@remark This currently requires the high-level KafkaConsumer
@returns An allocated string containing the current broker-assigned group
member id, or NULL if not available.
The application must free the string with \p free() or
rd_kafka_mem_free()
@brief Returns this client's broker-assigned group member id
@remark This currently requires the high-level KafkaConsumer
@returns An allocated string containing the current broker-assigned group member id, or NULL if not available. The application must free the string with \p free() or rd_kafka_mem_free()