The index for the current availability Measurement Interval for this
PM session. This value will become the value for
jnxSoamLmHistoryAvailStatsIndex once the Measurement Interval
is completed. The duration of the Measurement Interval is specified
by jnxSoamLmCfgAvailabilityMeasurementInterval.
Measurement Interval indexes are assigned sequentially by
the SNMP Agent. The first Measurement Interval that occurs after
the session is started is assigned index 1.