docs: public synchronized static void init(final NewExtensionListener _listener)
      {
          PeerMonitor.listener = _listener;
  
          if (PeerMonitor.self == null)
          {
              PeerMonitor.self = new PeerMonitor();
          }
          else if (_listener != null)
          {
              logger.error("Call to PeerMonitor.init, but it's already initialized. Listener will not be set");
          }
      }