The tag should be used for tasks related to the adoption of MediaWiki-extensions-CommunityConfiguration. In scope are tasks for extensions that make use of CommunityConfiguration (GrowthExperiments, Automoderator, etc); out of scope are tasks for functionality in the CommunityConfiguration extension itself (use MediaWiki-extensions-CommunityConfiguration as an extension tag instead).
Tagging adoption-related tasks allows the Growth-Team and others to quickly find tasks from CommunityConfiguration users, making it easier to reply to feedback.