public long getScheduledTombstoneCount() {
    long result = 0;
    result += replicatedTombstoneSweeper.getScheduledTombstoneCount();
    result += nonReplicatedTombstoneSweeper.getScheduledTombstoneCount();
    return result;
  }
remove all tombstones for the given region. Do this when the region is cleared or destroyed.
geode-core/src/main/java/org/apache/geode/internal/cache/TombstoneService.java