Also, have you not got a PC connected to the network? I assume you only have a small screen on the pi which is why we can't see it all. If you connect to grafana from the PC using the IP address of the pi instead of localhost in the browser it might be easier.
[Edit] Also look in syslog as before when you try to refresh the screen, you should see the query there and it may then be more obvious what the problem is.
You say you haven't changed anything, but in that case why have you blanked out the influxdb url? Last time you showed that screen, when viewed on the pi, it had 127.0.0.1 (which is localhost) there, so why have you blanked it out if you haven't changed it? Remember when viewing that screen from the PC you are looking at grafana running on the pi and the settings there are for grafana. It doesn't make any difference to what you should put for the url if you are viewing it in a browser on the pi or via the internet from the other side of the world. The url that grafana uses to access influx is still localhost.
I don't think that is correct. I think it defaults to enabled. Certainly mine is working without that, those lines are commented out on mine. Also he did have the datasource connected ok, and now that seems to be not the case.
In my previous post/topic i upload screenshot with similar type of data and it was deleted, and that's why i'm more careful with that type of screenshots.
I try two URLs: 127.0.0.1 and 192.168.1.8, but nothing. Can this be the problem?
What? I thought you had installed grafana on the pi. Why are you using that address?
Edit: What url are you using in the address bar of the browser when you view it in the browser on the pi?
Right, so to connect to grafana installed on the pi, using a browser on the pi, you use localhost:3000. localhost is a effectively a shorthand for "my ip address". To connect from the PC you need to use the ip address of the pi, which will probably be something like 192.168.1.101, so in the browser on the PC use 192.168.1.101:3000. Replace the ip address with whatever is the right address of course.
What you have been doing is looking at an installation of grafana on their own website, not on the pi, so obviously it couldn't connect to your influxdb.