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There's a Grafana Add-on for HA that does without Prometheus as an integration.
That does mean that you need to have the right type of installation though, and have Supervisor installed.
NotThamesWater-
I prefer all my stuff to do one thing only.
So the NAS is just file storage.
The Raspberry Pi with Home Assistant is just Home Assistant.
The Plex server is just the Plex server.
The Grafana is just the Grafana.
And so on.Been burned far too many time by "this thing failed, and oops it's also these 2 other things and now it's all lost.".
Velocio
Got carried away with Home Assistant, and then realised that everything in Home Assistant goes to Prometheus, meaning I can plot everything over time in Grafana Cloud.
So here's the temp in all rooms for the past week, and when the heating has been on (the red vertical bars). There's a 6'c difference between the warmest and coldest rooms.
Sensors are the Philips Hue motion sensors which include thermometer. But I also have an Aranet4 in my office, and the Nest thermostat is reporting temp, target temp and whether or not it is heating.
This detail isn't in Nest in any meaningful way, so seeing it like this is great.