labels property

One or more label entries that apply to the Group.

Currently supported labels contain a key with an empty value. Google Groups are the default type of group and have a label with a key of cloudidentity.googleapis.com/groups.discussion_forum and an empty value. Existing Google Groups can have an additional label with a key of cloudidentity.googleapis.com/groups.security and an empty value added to them. This is an immutable change and the security label cannot be removed once added. Dynamic groups have a label with a key of cloudidentity.googleapis.com/groups.dynamic. Identity-mapped groups for Cloud Search have a label with a key of system/groups/external and an empty value.

Required.