This setting is a smoothing factor for determining the next check-in for individual sensors.
Default: 0.1
For example, if calculated check-in offset (calculated at runtime based on the number of active sensors, divided by SensorCheckinDelayRate) is 60 , and SensorCheckinDelayVariancePct is 0.1, then actual next sensor check-in time is 60 +- 6. This helps distribute sensor check-ins evenly.
Note: New in version 6.0.
