The labels that apply to the Group. Contains 'cloudidentity.googleapis.com/groups.discussion_forum': '' if the Group is a Google Group or 'system/groups/external': '' if the Group is an external-identity-mapped group.
The parent resource under which to list all Groups. Must be of the form identitysources/{identity_source_id} for external- identity-mapped groups or customers/{customer_id} for Google Groups.