This read-create value sets the sampling interval, in seconds (10-65535), over which the monitored variable is measured before being compared against the rising and falling thresholds. Because deltaValue sampling subtracts the previous reading from the current one, admins must keep this interval short enough that the counter can't wrap past 2^31-1 in one cycle, and once the row's status is set to valid the interval becomes locked and can't be changed. A typical setup leaves this at its default of 1800 seconds (30 minutes), sampling a counter once per half hour.