docs: private String getTrackerAddressConfigString() {
          StringBuffer config = new StringBuffer();
          for (int i = 0; i < trackerAddressCircular.size(); i++) {
              TrackerAddressHolder holder = trackerAddressCircular.next();
              InetSocketAddress address = holder.getAddress();
              config.append(address.toString()).append(",");
          }
          return new String(config);
      }