Custom views can also have predefined metrics, which are values calculated from the view attributes.
About predefined metrics
Predefined metrics are values calculated from view attributes. For example, if the attributes for a view include product price and cost information, you could calculate predefined metrics such as the ratio of retail price to cost.
Configuring a predefined metric for a view
From the predefined metrics list on the Views page, you can configure the metric name, description, definition, and display. The display name and definition can be localized for each of the available locales.
Deleting a predefined metric
You can delete predefined metrics from a view. Before deleting a predefined metric, try to make sure that it is not being used by a component.