Wildcards in tag values can used be to retrieve multiple series from the server instead of defining separate series for each tag in the widget configuration.
The * wildcard can be specified both in tag value as well as in entity name.
[series] entity = nurswgvml007 metric = disk_used_percent [tags] mount_point = *
The wildcard series can be referenced by derived series using aliases.
Wildcard series are supported in all widgets including bar widgets.
The bar widget provides a multiple-column setting which places derived series with the same entity and tags into separate columns.