https://lwn.net/Articles/1019686/#CommAnchor1019710
And in this case it means that it's not AGPL, but proprietary. Which kind of proves my point: they are apparently paying Grafana Labs to avoid the constraints of AGPL. If Grafana was permissive, they would surely not pay.
https://lwn.net/Articles/1019686/#CommAnchor1019710