docs: @Override
      public void registerForEvents(SIMPMessage msg)
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(tc, "registerForEvents", msg);
  
          msg.registerMessageEventListener(MessageEvents.EXPIRY_NOTIFICATION, this);
          msg.registerMessageEventListener(
                                           MessageEvents.REFERENCES_DROPPED_TO_ZERO,
                                           this);
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(tc, "registerForEvents");
      }