Take a look at the new version of Power BI Premium Capacity Metrics app. This latest version now has system metrics by workloads, and total active dataset size in memory metrics. In addition to demoing this latest version, Power BI program manager Swati Gupta, will be more than happy to answer your Power BI Premium questions.
For more tips like this, check out the working remotely playlist at www.youtube.com/FoetronAcademy . Also, if you need any further assistance then you can raise a support ticket and get it addressed.