The operation for which this constraint will be applied. To apply
this constraint only when creating new VMs, the method_types
should be CREATE only. To apply this constraint when creating or
deleting VMs, the method_types should be CREATE and
DELETE.
UPDATE only custom constraints are not supported. Use CREATE
or CREATE, UPDATE.
Values:
METHOD_TYPE_UNSPECIFIED (0):
Unspecified. Results in an error.
CREATE (1):
Constraint applied when creating the
resource.
UPDATE (2):
Constraint applied when updating the
resource.
DELETE (3):
Constraint applied when deleting the
resource. Not supported yet.