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opCharts has dashboards built into the heart of it's engine. Dashboards have the ability to display components, components can load data from many different sources and display it as a graph/table/pie/chart/etc. Right now only graphs are supported.
Customising the opCharts GUI contains some tips for GUI customisation.
Users, Roles, Privileges and Objects ( Portal mode / RBAC)
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Remember to restart the omkd daemon after making configuration changes.