Hello,
A little bit difficult to describe as a problem, so a picture is better than a thousand words
As you see Grafana does not find a server.
Because of that, everywhere where it is written $server$ in sql requests, I have no outgoing data. only N/A is displayed
Has anyone encountered this problem before?
Thanks.
welcome to the 
community @jokinesse!
It looks like you’re using a dashboard with dashboard template variables that aren’t correctly matching the server name in your data. Did you create this dashboard yourself or import a pre-configured one?
Here are some resources that might help you to look deeper into how that variable is configured:
docs: templates and variables topic
inspect dashboard variables and their dependencies
If you can export and share the dashboard json and a sample of your data, the community might be able to offer some insight into why it’s not finding that server.
