of a rule to workloads in that namespace.
                            type: string
                          statPrefix:
                            description: The human readable prefix to use when emitting
                              statistics for this route.
                            type: string
                          uri:

    } else {
      addPendingString(builder); // delegates to addDoneString if future completes midway
    }
    return builder.append("]").toString();
  }

  /**
   * Provide a human-readable explanation of why this future has not yet completed.
   *
   * @return null if an explanation cannot be provided (e.g. because the future is done).
   * @since 23.0
   */
  @CheckForNull