public void addExpiry(ExpirationType type, Integer timeout, ExpirationAction action) {
    if (expirations == null) {
      expirations = new ArrayList<>();
    }
    expirations.add(new Expiration(type, timeout, action));
  }
@return the redundant copies of a region
geode-management/src/main/java/org/apache/geode/management/configuration/Region.java