broker :: %{node_id: integer, host: binary, port: 0..65535}

partition :: %{error: Cafex.Protocol.error, partition_id: integer, leader: integer, replicas: [integer], isrs: [integer]}

t :: %Cafex.Protocol.Metadata.Response{brokers: [broker], topics: [topic]}

topic :: %{error: Cafex.Protocol.error, name: binary, partitions: [partition]}