@Override
    protected void checkExpiredTombstoneGC() {
      if (shouldCallExpireBatch()) {
        forceBatchExpiration = false;
        expireBatch();
      }
      checkIfBatchExpirationShouldBeForced();
    }
Returns true if keys needs to be tracked for clients registering interests on PR.
geode-core/src/main/java/org/apache/geode/internal/cache/TombstoneService.java