@Override
    public String toString() {
      return "StateStabilizationMessage(recipients=" + getRecipientsDescription()
          + ",requestingMember=" + requestingMember + ",processorId=" + processorId + ")";
    }
whether this is a simple request/response two-party flush or (false) a proxied flush
geode-core/src/main/java/org/apache/geode/internal/cache/StateFlushOperation.java