This object is an index that specifies which period of time, the next 5 objects refer to. currentPeriod - the period since last systemResetAllStatsCmd received or since Start-up (if no systemResetAllStatsCmd was received since Start-up) until now. lastPeriod - the period between last two commands of systemResetAllStatsCmd. - If only one command occurred since Start-up: the period between Start-up and last command. - If no command occurred since Start-up: this period will not actually exist. In this case, he following 5 objects will be 0.