code: func NewProducerConf() ProducerConf {
  	return ProducerConf{
  		Compression:    proto.CompressionNone,
  		RequiredAcks:   proto.RequiredAcksAll,
  		RequestTimeout: 5 * time.Second,
  		RetryLimit:     10,
  		RetryWait:      200 * time.Millisecond,
  		Logger:         nil,
  	}
  }
docs: // NewProducerConf returns a default producer configuration.