@Override
  public Optional<String> getUrlOverride(@Nonnull String service, @Nonnull Link quickLink) {
    return Optional.ofNullable( urlOverrides.get(Pair.of(service, quickLink.getName())) );
  }
Map of (service name, link name) -> url
ambari-server/src/main/java/org/apache/ambari/server/state/quicklinksprofile/DefaultQuickLinkVisibilityController.java