This object indicates a number (normally between 1 and
96 to cover a 24 hour period) which identifies the interval
for which the set of statistics is available. The interval
identified by 1 is the most recently completed 15 minute
interval, and the interval identified by N is the interval
immediately preceding the one identified by N-1.
The minimum range of N is 1 through 4.The default range
is 1 through 32. The maximum value of N is 1 through 96.