This object holds a unique index identifying which specific sensor row, out of potentially several per module, generated a given trap. Since a single card can carry multiple sensors (intake, exhaust, CPU, and so on), this index is what lets a trap receiver point an admin at the exact sensor that crossed a threshold rather than just the module in general. For example, an index of 3 pointing specifically to the exhaust sensor, rather than the intake sensor also present on the same card, tells the admin exactly where the airflow problem likely originates.