With Log Analytics integration in Power BI, you can now capture Analysis Services trace events easily and over a longer period of time. Combined with the Power BI template report, you can gain a lot of insights into usage of your datasets. With more to come down the road!
Announcing long-term usage and performance insights (Public Preview)
https://powerbi.microsoft.com/en-us/blog/announcing-long-term-usage-and-performance-insights-public-preview/
Using Azure Log Analytics in Power BI (Preview)
https://docs.microsoft.com/power-bi/transform-model/log-analytics/desktop-log-analytics-overview