Hi,
Just wanted to say that I’m running OH2 stable on Buster/Java 11 - /wo any issues. But yes, as the docs say Java 8 is required.
Can you please verify in Grafana’s data-source administration that there is everything up to date?
Just wanted to tell you that there’s no direct data-flow from OH to Grafana. Grafana “pulls” data from a data-base (in most cases a time-series DB is preferred, e.g. influxDB).
If you need a GUI for data exploration, I strongly recommend Chronograf. After installation, you can easily browse your influxdb and see what happens.
One thing you could also double-check if persistence is set-up correctly. There was an issue last week, maybe this helps!