func GCPProjectNumber(value string) Instance {
	return newOption("gcp_project_number", value)
}

func Metadata(meta *model.BootstrapNodeMetadata) Instance {
	return newOption("metadata", meta)
}

func STSEnabled(value bool) Instance {
	return newOption("sts", value)
}

func DiscoveryHost(value string) Instance {
	return newOption("discovery_host", value)
}

func MetadataDiscovery(value bool) Instance {

	}

	if cfg.Metadata.StsPort != "" {
		stsPort, err := strconv.Atoi(cfg.Metadata.StsPort)
		if err == nil && stsPort > 0 {
			opts = append(opts,
				option.STSEnabled(true),
				option.STSPort(stsPort))
			md := cfg.Metadata.PlatformMetadata
			if projectID, found := md[platform.GCPProject]; found {
				opts = append(opts, option.GCPProjectID(projectID))
			}
		}
	}