v3 "istio.io/istio/pilot/pkg/xds/v3"
	"istio.io/istio/pkg/backoff"
	"istio.io/istio/pkg/log"
	"istio.io/istio/pkg/slices"
	"istio.io/istio/pkg/util/sets"
)

var deltaLog = log.RegisterScope("deltaadsc", "delta adsc debugging")

type resourceKey struct {
	Name    string
	TypeURL string
}

func (k resourceKey) shortName() string {
	return v3.GetShortType(k.TypeURL) + "/" + k.Name
}

	"istio.io/istio/pilot/pkg/model"
	v3 "istio.io/istio/pilot/pkg/xds/v3"
	"istio.io/istio/pkg/test"
)

func NewDeltaAdsTest(t test.Failer, conn *grpc.ClientConn) *DeltaAdsTest {
	test.SetForTest(t, &features.DeltaXds, true)
	return NewDeltaXdsTest(t, conn, func(conn *grpc.ClientConn) (DeltaDiscoveryClient, error) {
		xds := discovery.NewAggregatedDiscoveryServiceClient(conn)
		return xds.DeltaAggregatedResources(context.Background())
	})

	EnableGatewayAPIGatewayClassController = env.Register("PILOT_ENABLE_GATEWAY_API_GATEWAYCLASS_CONTROLLER", true,
		"If this is set to true, istiod will create and manage its default GatewayClasses").Get()

	DeltaXds = env.Register("ISTIO_DELTA_XDS", true,
		"If enabled, pilot will only send the delta configs as opposed to the state of the world on a "+

func (cfg Config) toTemplateParams() (map[string]any, error) {
	opts := make([]option.Instance, 0)

	discHost := strings.Split(cfg.Metadata.ProxyConfig.DiscoveryAddress, ":")[0]

	xdsType := "GRPC"
	if features.DeltaXds {
		xdsType = "DELTA_GRPC"
	}

	// Waypoint overrides
	metadataDiscovery := cfg.Metadata.MetadataDiscovery
	if strings.HasPrefix(cfg.ID, "waypoint~") {
		xdsType = "DELTA_GRPC"
		metadataDiscovery = true