Power BI Embedded Premium evaluates your level of utilization by aggregating utilization records every 30 seconds. Each evaluation is composed of two different aggregations: Interactive utilization and background utilization.
Interactive utilization is evaluated by considering all the interactive operations that completed on or near the current half-minute evaluation cycle.
Background utilization is evaluated by considering all the background operations that completed during the past 24 hours, where each background operation contributes only 1/2880 of its total CPU cost (there are 2880 evaluation cycles in each 24-hour period).
A capacity consists of a defined number of v-cores. The Power BI Premium Utilization and Metrics app tracks the utilization of your capacity v-cores. The CPU usage reported in the app drives the need to autoscale.