The available data sources are much like a library. First you add a data source to a dashboard, then you associate the data source with one or more metrics displayed under Metrics on the left side of the Dashboards window.
Data sources are dashboard-wide and you can apply them to any metrics you want. (For details about the available metrics, see Metrics for dashboards.)
Note:
If a data source cannot be applied to a metric, the metric will be dimmed on the left side of the window.
Data Sources buttons
Data Sources buttons – These buttons in the upper-left corner of the Dashboards window allow you to:
Add a new data source – Displays a dialog where you can make selections to create a new data source.
Set a data source for a selected metric – Sets the data source for the currently selected metric.
Edit a data source – Displays options for modifying a data source.
Remove unused data sources from a dashboard – Removes all unused data sources for the current dashboard.