We need to be able to identify if we reach the 250 values limit or
not.List Variable Adobe Client Care answer:The limit of 250 values is
saved at a visitor by visitor level in the back end of the data base.
This information is not available for which visitor has the value
reached 250 and for whom it has not. The report for list variable shows
aggregate values. Further, impressions may not be exactly same in case
user had got some values expired because of reaching the limit of 250