@Override
  public void takeSnapshotOfAggregatedAccountStatsAndUpdateMonth(String monthValue) throws Exception {
    currentMonth = monthValue;
    monthlyAggregatedAccountStats = aggregatedAccountStats;
  }
Constructor to instantiate an {@link InmemoryAccountStatsStore}.
@param clusterName the clusterName
@param hostname the hostname
ambry-mysql/src/main/java/com/github/ambry/accountstats/InmemoryAccountStatsStore.java