@Override
  public String toString() {
    return "ConsensusGroupStatisticsChangeEvent{"
        + "differentConsensusGroupStatisticsMap="
        + differentConsensusGroupStatisticsMap
        + '}';
  }
ConsensusGroupStatisticsChangeEvent represents the change of consensus statistics.
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/manager/load/subscriber/ConsensusGroupStatisticsChangeEvent.java