[Feature] Prometheus metrics

[CrazyWolf13]

I have searched the existing feature requests to make sure this is not a duplicate request.

• Yes

The feature

Hi

I generally get my metrics via Prometheus into Grafana, so I can monitor everything from there.

For this project it would be awesome, to get a nice Grafana board with system metrics, and also some flight metrics, as Prometheus is the kinda go-to standard which is still easy to implement, I guess that would be a nice addition, however feel free to put this as low-prio, as the Grafana Board would probably be quite a bit time-consuming