return metadataSupplier{
		Property: property,
		Fn:       fn,
	}
}

func isMetadataEndpointAccessible() bool {
	// From the Go package, but private so copied here
	const metadataHostEnv = "GCE_METADATA_HOST"
	const metadataIP = "169.254.169.254"
	host := os.Getenv(metadataHostEnv)
	if host == "" {
		host = metadataIP
	}
	_, err := net.DialTimeout("tcp", defaultPort(host, "80"), 5*time.Second)
	if err != nil {