code: public static Tag method(ContainerRequest request) {
          return (request != null) ? Tag.of("method", request.getMethod()) : METHOD_UNKNOWN;
      }
docs: Creates a {@code method} tag based on the {@link ContainerRequest#getMethod()
  method} of the given {@code request}.
  @param request the container request
  @return the method tag whose value is a capitalized method (e.g. GET).