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BrokerMetadataRequest => (empty)
 
BrokerMetadataResponse => ApiVersionProtocolVersion [Key Value]
  ProtocolVersion => int32   // Global protocol version, bumped manually for each addition to the protocol. Starts at 9 (for 0.9.0.0) with the addition of this request type.
  Key => String              // Generic key name, such as "broker.version"
  Value => String            // Generic value for key, e.g. "0.9.0.0"