Key Metric Editor
When you select Performance > Show Key Metrics, this editor appears for devices that have such metrics. It displays the available Metrics, and a Chart panel where you can configure their display.
This panel’s display depends on the selected device.
Click Chart to first select up to three metrics you want to graph, and the polling interval for the graph.
Then click Save, and the graph appears.
Click the screwdriver / wrench icon in the upper right corner to return to the chart configuration screen.