Grafana looks nice! Have you looked at other tools too and made an evaluation or was it a no brainer to use Grafana?
to be honest, I tried to use SSRS web portal itself and other "monitoring tools" (with the capability of writing custom queries). Grafana is the result of a technology selection made while I was preparing a session for an event 🙂
No big effort, no deep development. Just write and try on a portal hosted by my machine. A real killer app.