@Override
    protected boolean hasExpired(long msUntilTombstoneExpires) {
      if (testHook_forceExpirationCount > 0) {
        testHook_forceExpirationCount--;
        return true;
      }
      /*
       * In case the tombstone expiration time would be too far out lets cap it. This is just
       * making the system fault tolerant in the case that there are large clock jumps or
       * unrealistically large timestamps.
       */
      return msUntilTombstoneExpires <= 0 || msUntilTombstoneExpires > EXPIRY_TIME;
    }
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