What is the best way to track service utilization?

Amount of service revenue billed by the entire service team

Service Utilization is a measure of how effective the service team is. Ideally your service team should be billing 3x the combined salary of the entire service team. You want to know the amount of revenue service team brings in as a whole. Tracking by billable hours worked, or service revenue billed per technician is difficult to track accurately, creates friction during non-billable work, and affects customer service. Tracking by billable hours worked by the entire service team is easier to track accurately, and is a good statistic to have for other reasons, but it is too focused on a one to one ratio of available billable time to revenue billed, which is limiting. The best way to track individual utilization is to track total hours worked (of all kinds) by technician