Metadata Response (Version: 4) => throttle_time_ms [brokers] cluster_id controller_id [topic_metadata] throttle_time_ms => INT32 brokers => node_id host port rack node_id => INT32 host => STRING port => INT32 rack => NULLABLE_STRING cluster_id => NULLABLE_STRING controller_id => INT32 topic_metadata => error_code topic is_internal [partition_metadata] error_code => INT16 topic => STRING is_internal => BOOLEAN partition_metadata => error_code partition leader [replicas] [isr] error_code => INT16 partition => INT32 leader => INT32 replicas => INT32 isr => INT32