@Override
    public void appendFields(StringBuilder sb) {
      super.appendFields(sb);
      if (eventId != null) {
        sb.append("; eventId=").append(eventId);
      }
      sb.append("; entries=").append(removeAllDataSize);
      if (removeAllDataSize <= 20) {
        // 20 is a size for test
        sb.append("; entry values=").append(Arrays.toString(removeAllData));
      }
    }
Note this this is a "dummy" event since this message contains a list of entries each one of
which has its own event. The key thing needed in this event is the region. This is the event
that gets passed to basicOperateOnRegion
geode-core/src/main/java/org/apache/geode/internal/cache/DistributedRemoveAllOperation.java