Need more info in Engine Manager Log

Hi Team,

When I look at the Engine Manger log, I see the below content

12:50:41:596 Forecasting [2,3872,9]

12:50:42:985 [2,3872,9]  forecast failed.

12:50:43:094 [2,3873,9]  has a usable number of observations.(156)

Specifically this when I notice, [2,3872,9]

2 -- ???

3872 - Item id in Demantra

9 - ???

Could someone let me know what those 2 fields represents in log ??? (Like Level id, group id)

Thanks