public Map<TConsensusGroupId, Pair<ConsensusGroupStatistics, ConsensusGroupStatistics>>
      getDifferentConsensusGroupStatisticsMap() {
    return differentConsensusGroupStatisticsMap;
  }
ConsensusGroupStatisticsChangeEvent represents the change of consensus statistics.
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/manager/load/subscriber/ConsensusGroupStatisticsChangeEvent.java