private void cleanOverflowStats(Cache cache) {
    ManagementService service = ManagementService.getManagementService(cache);
    if (!asyncEvent) {
      GatewaySenderMBean bean =
          (GatewaySenderMBean) service.getLocalGatewaySenderMXBean(sender.getId());
      if (bean != null) {
        bean.getBridge().clearOverflowStatistics();
      }
    }

  }
Start the background batch removal thread.
geode-core/src/main/java/org/apache/geode/internal/cache/wan/parallel/ParallelGatewaySenderQueue.java