code: func setVersionUserAgent(backfill bool, parserName string) {
  	if BuildID == "" {
  		version = "dev"
  	} else {
  		version = BuildID
  	}
  	if backfill {
  		parserName += " backfill"
  	}
  	libhoney.UserAgentAddition = fmt.Sprintf("honeytail/%s (%s)", version, parserName)
  }
docs: // setVersion sets the internal version ID and updates libhoney's user-agent