Select only placement groups belonging with this group type. A package is a simple group of placements that acts as a single pricing point for a group of tags. A roadblock is a group of placements that not only acts as a single pricing point but also assumes that all the tags in it will be served at the same time. A roadblock requires one of its assigned placements to be marked as primary for reporting.
public enum PlacementGroupsResource.ListRequest.PlacementGroupTypeEnum