The type of restriction.

RESTRICTION_TYPE_UNSPECIFIED Unknown restriction type.
ALLOW_ALL_GCP_RESOURCES Allow the use all of all gcp products, irrespective of the compliance posture. This effectively removes gcp.restrictServiceUsage OrgPolicy on the AssuredWorkloads Folder.
ALLOW_COMPLIANT_RESOURCES Based on Workload's compliance regime, allowed list changes. See - for the list of supported resources.
APPEND_COMPLIANT_RESOURCES Similar to ALLOW_COMPLIANT_RESOURCES but adds the list of compliant resources to the existing list of resources. Effective org-policy of the Folder is considered to ensure there is no disruption to the existing customer workflows.