code: public static Tag uri(RequestEvent event) {
          ContainerResponse response = event.getContainerResponse();
          if (response != null) {
              int status = response.getStatus();
              if (isRedirection(status)) {
                  return URI_REDIRECTION;
              }
              if (status == 404) {
                  return URI_NOT_FOUND;
              }
          }
          String matchingPattern = getMatchingPattern(event);
          if (matchingPattern.equals("/")) {
              return URI_ROOT;
          }
          return Tag.of("uri", matchingPattern);
      }
docs: Creates a {@code uri} tag based on the URI of the given {@code event}. Uses the
  {@link ExtendedUriInfo#getMatchedTemplates()} if
  available. {@code REDIRECTION} for 3xx responses, {@code NOT_FOUND} for 404 responses.
  @param event the request event
  @return the uri tag derived from the request event