The dimension Data Source is now available when reconfiguring or connecting new Google Analytics data sources.
The Data Source dimension in Google Analytics represents the data source of a hit. By default, hits sent from analytics.js are reported as "web" and hits sent from the mobile SDKs are reported as "app". These values can be overridden in the Measurement Protocol.
To find out more about our Google Analytics connector, check out the What data can I get from Google Analytics? knowledge base article.