The operation in which this constraint will be applied. For example:
If the constraint applies only when create VMs, the method_types
will be "CREATE" only. If the constraint applied when create or
delete VMs, the method_types will be "CREATE" and "DELETE".
Values:
METHOD_TYPE_UNSPECIFIED (0):
Unspecified. Will results in user 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.