The 'Server' dimension typically lists the hostname of the site. For report suites that combine multiple domains or subdomains, this dimension is valuable to see which domains or subdomains perform the best.
This dimension is related to the Page and Site section dimensions. Page is most granular, Server is least granular, and Site section is between the two.
Dimension values include servers on your site. Your organization determines what specific dimension values you want to use. Some organizations use window.location.hostname , while others formulate a custom values. Whatever method you use, make sure it is consistent and that you record it in a solution design document .