Grafana can get pretty info dense very quickly. Try some of the dashboards or the Explore feature here https://play.grafana.org/

I worked there as a product designer for a couple of years, I now work on even more data dense UI in the cyber security domain, e.g. https://elastio.com/blog/cyber-recovery/three-clicks-to-rans...

As with almost all UI design the answer is "It Depends". If you could provide a little more context around the domain you're working in I'm sure I could point you at some specific examples