IT Professionals need tools to track usage from specific business units. If you search you can find lot of monitoring tolls that can do this job but most of them need to pay and for free open source need an advance knowledge to install, configure and enable measure metrics for the resources that you want.
I don't want to say don't use Monitoring Tool in your enviroment. But it takes times and need people to do this. If you are alone you need a quick solution until decide your Monitoring Solution in your enviroment.