public static long getTimestampForEntry(Object key, String regionName) {
    final Region<?, ?> r = cache.getRegion(SEPARATOR + regionName);
    if (r.getEntry(key) == null) {
      return 0;
    }
    return r.getEntry(key).getStatistics().getLastModifiedTime();
  }
To be used only for ParallelGatewaySender.

@param senderId Id of the ParallelGatewaySender
geode-wan/src/distributedTest/java/org/apache/geode/internal/cache/wan/WANTestBase.java