message: Bug Don't show Prometheus UI link when not discovered
diff: @@ -180,11 +180,13 @@ const headerPrometheusLinkStateToProps = ({ UI }: RootState, { urls }) => {
  };
  };
  -const HeaderPrometheusLink_ = ({ url }) => (
  +const HeaderPrometheusLink_ = ({ url }) => {
  + return url ? (
  <span className="monitoring-header-link">
  <ExternalLink href={url} text="Prometheus UI" />
  </span>
  -);
  + ) : null;
  +};
  const HeaderPrometheusLink = connectToURLs(MonitoringRoutes.Prometheus)(
  connect(headerPrometheusLinkStateToProps)(HeaderPrometheusLink_),
  );
  