for _, response := range responses {
		retval[CpInfo(response).ID] = response
	}

	return retval, nil
}

// CpInfo returns the Istio control plane info from JSON-encoded XDS ControlPlane Identifier
func CpInfo(xdsResponse *discovery.DiscoveryResponse) pilotxds.IstioControlPlaneInstance {
	if xdsResponse.ControlPlane == nil {
		return pilotxds.IstioControlPlaneInstance{