@Override
  public void initializeStats(long numEntriesInVM, long numOverflowOnDisk,
      long numOverflowBytesOnDisk) {
    this.numEntriesInVM.set(numEntriesInVM);
    this.numOverflowOnDisk.set(numOverflowOnDisk);
    this.numOverflowBytesOnDisk.set(numOverflowBytesOnDisk);
  }
This constructor is used when we are closing an existing region. We want to remember that it is
still present in the disk store.
geode-core/src/main/java/org/apache/geode/internal/cache/PlaceHolderDiskRegion.java