Take a look at the new version of Power BI Premium Capacity Metrics app. In addition to comprehensive refresh, query, and eviction metrics for past 7 days, this latest version now has system metrics by workloads, and total active dataset size in memory metrics. This app is applicable to admins.
Along with demoing this latest version, Power BI program manager Swati Gupta will be more than happy to answer your Power BI Premium questions.
For a preview of what Swati will be demoing, check out her blog post on this exciting new tool!