Overload events that take place in the middle of the day are likely to affect many users. Overload events that take place in the middle of the night will probably affect only a handful of users. The overload score is designed to help you differentiate between these two overload events, so that you can single out the Power BI items (such as reports and datasets) that most impact your users.
The overload score is calculated in two steps:
The amount of CPU seconds belonging to interactive queries affected by an overload event is summed.
The value form step 1 is multiplied by the count of interactive operations that were affected by throttling.