Share query results with another panel
The Dashboard data source lets you select a panel in your dashboard that contains the queries you want to share the results for. Instead of sending a separate query for each panel, Grafana sends one query and other panels use the query results to construct visualizations.
This strategy can drastically reduce the number of queries being made when you for example have several panels visualizing the same data.
Define the query or queries that you want share.
In the Use results from panel list, select the first panel you created.
You can click on any of the queries to go to the panel where they are defined.