The Gtmhub connection, data sources, and entities are used for generating Gtmhub reports.
Unlikely other connections and data sources which you can add, delete, and modify, the Gtmhub items are immutable by default (cannot be edited or deleted). This is so because the Gtmhub data sources and entities extract data directly from your Gtmhub account and enable you to customize a report according to your organizational needs.
Any employee with a role including "Manage data" permission can preview and create insights querying these entities.
Here's how the pre-installed Gtmhub connection, data sources, and entities differ from the others in your account:
The Gtmhub connection cannot be modified while 3rd-party ones can be edited, connected to a new data source or deleted.
Gtmhub data sources (GtmhubPlanningSessions, GtmhubGoals, GtmhubMetrics, etc.) can only be synced while 3rd-party ones can be modified entirely (sync, edit, create an entity, schema changes, delete).
Gtmhub entities (GtmhubPlanningSessions, GtmhubGoals, GtmhubMetrics, etc.) can only be opened while 3rd-party ones can be opened and deleted.