code: func (c *ServersetSDConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
  	*c = DefaultServersetSDConfig
  	type plain ServersetSDConfig
  	err := unmarshal((*plain)(c))
  	if err != nil {
  		return err
  	}
  	if len(c.Servers) == 0 {
  		return errors.New("serverset SD config must contain at least one Zookeeper server")
  	}
  	if len(c.Paths) == 0 {
  		return errors.New("serverset SD config must contain at least one path")
  	}
  	for _, path := range c.Paths {
  		if !strings.HasPrefix(path, "/") {
  			return errors.Errorf("serverset SD config paths must begin with '/': %s", path)
  		}
  	}
  	return nil
  }
docs: // UnmarshalYAML implements the yaml.Unmarshaler interface.