Grafana is now going to be distributed under the AGPLv3 https://grafana.com/blog/2021/04/20/grafana-loki-tempo-relicensing-to-agplv3/

I'm not lawyerly enough to articulate the implications of this on Linkerd's use of Grafana in the viz extension but, before upgrading Grafana, we'll need to understand this more fully so that those who are adopting or distributing Linkerd--an Apache v2 licensed project--can make informed decisions about the use AGPLv3 code.

As a starting point, we may want to entirely separate a linkerd-grafana extension so that linkerd-viz can be installed without having to worry about these licensing restrictions.