in spectator/writer/writer.go [76:86]
func IsValidOutputLocation(output string) bool {
return output == "none" ||
output == "memory" ||
output == "stdout" ||
output == "stderr" ||
output == "udp" ||
output == "unix" ||
strings.HasPrefix(output, "file://") ||
strings.HasPrefix(output, "udp://") ||
strings.HasPrefix(output, "unix://")
}