You can generate a XML file records your disk usage via your plugin as a step and then publish it by using Custom Statistics Report plugin to collect the disk usage. Then in the dashboard, you can add a Custom Statistics History Gadget to render the line chart.
You can generate a XML file records your disk usage via your plugin as a step and then publish it by using Custom Statistics Report plugin to collect the disk usage. Then in the dashboard, you can add a Custom Statistics History Gadget to render the line chart.