return
	}

	im := getOrCreateIstioMetadata(cluster)

	// Add services field into istio metadata
	im.Fields["services"] = &structpb.Value{
		Kind: &structpb.Value_ListValue{
			ListValue: &structpb.ListValue{
				Values: []*structpb.Value{},
			},
		},
	}

	svcMetaList := im.Fields["services"].GetListValue()

                 << attr_value.value_case();
  }
  return "<Unknown AttrValue type>";  // Prevent missing return warning
}

bool IsEmptyList(const AttrValue::ListValue& list) {
  return list.s_size() == 0 && list.i_size() == 0 && list.f_size() == 0 &&
         list.b_size() == 0 && list.type_size() == 0 &&
         list.shape_size() == 0 && list.tensor_size() == 0;
}