docs: private Status statusFromTrailers(Metadata trailers) {
      Status status = trailers.get(InternalStatus.CODE_KEY);
      if (status != null) {
        return status.withDescription(trailers.get(InternalStatus.MESSAGE_KEY));
      }
      // No status; something is broken. Try to provide a resonanable error.
      if (headersReceived) {
        return Status.UNKNOWN.withDescription("missing GRPC status in response");
      }
      Integer httpStatus = trailers.get(HTTP2_STATUS);
      if (httpStatus != null) {
        status = GrpcUtil.httpStatusToGrpcStatus(httpStatus);
      } else {
        status = Status.INTERNAL.withDescription("missing HTTP status code");
      }
      return status.augmentDescription(
          "missing GRPC status, inferred error from HTTP status code");
    }