Switching between Prometheus servers in Grafana using data source variables
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Variables in Grafana (previously known as templates) allow parameterisation of a dashboard via a drop-down menu. Often this is used to switch between machines or services, so that you can have per-machine dashboards without needing to create a dashboard every time a new machine appears. They’re also stored in URL parameters, so could be linked from alert notifications or wiki pages.
Source: robustperception.io
