instanceIDFn       = metadata.InstanceID

	clusterNameFn = func() (string, error) {
		cn, err := metadata.InstanceAttributeValue("cluster-name")
		if err != nil {
			return "", err
		}
		return cn, nil
	}
	clusterLocationFn = func() (string, error) {
		cl, err := metadata.InstanceAttributeValue("cluster-location")
		if err == nil {
			return cl, nil
		}
		return metadata.Zone()
	}