code: func (h HealthcheckType) String() string {
  	switch h {
  	case HCTypeDNS:
  		return "DNS"
  	case HCTypeHTTP:
  		return "HTTP"
  	// TODO(angusc): Drop HTTPS as a separate type.
  	case HCTypeHTTPS:
  		return "HTTP" // NB: Not HTTPS
  	case HCTypeICMP:
  		return "ICMP"
  	case HCTypeRADIUS:
  		return "RADIUS"
  	case HCTypeTCP:
  		return "TCP"
  	// TODO(angusc): Drop TCPTLS as a separate type.
  	case HCTypeTCPTLS:
  		return "TCP" // NB: Not TCPTLS
  	case HCTypeUDP:
  		return "UDP"
  	}
  	return "(unknown)"
  }
docs: // String returns the name for the given HealthcheckType.