@Override
  protected void beforeExecute(Thread t, Runnable r) {
    if (poolStatHelper != null) {
      poolStatHelper.startJob();
    }
    if (threadsMonitoring != null) {
      threadsMonitoring.startMonitor(ThreadsMonitoring.Mode.SerialQueuedExecutor);
    }
  }
This class is used for the DM's serial executor. The only thing it currently does is increment
stats.
geode-core/src/main/java/org/apache/geode/distributed/internal/SerialQueuedExecutorWithDMStats.java