var logFiltered string
	if !req.Delta.IsEmpty() && !requiresResourceNamesModification(w.TypeUrl) {
		// Some types opt out of this and natively handle req.Delta
		logFiltered = " filtered:" + strconv.Itoa(len(w.ResourceNames)-len(req.Delta.Subscribed))
		w = &model.WatchedResource{
			TypeUrl:       w.TypeUrl,
			ResourceNames: req.Delta.Subscribed.UnsortedList(),
		}
	}

	var res model.Resources

	if config == nil {
		config = &DeltaADSConfig{}
	}
	delta := NewDelta(discoveryAddr, config, opts...)
	delta.cfg.BackoffPolicy = backoffPolicy
	return delta
}

func typeName[T proto.Message]() string {
	ft := new(T)
	return resource.APITypePrefix + string((*ft).ProtoReflect().Descriptor().FullName())
}

  }

  /** Returns a new bias. */
  private fun adapt(
    delta: Int,
    numpoints: Int,
    first: Boolean,
  ): Int {
    var delta =
      when {
        first -> delta / DAMP
        else -> delta / 2
      }
    delta += (delta / numpoints)
    var k = 0
    while (delta > ((BASE - TMIN) * TMAX) / 2) {
      delta /= (BASE - TMIN)
      k += BASE
    }

issue:
  - 47949
releaseNotes:
  - |
    **Enabled** [Delta xDS](https://www.envoyproxy.io/docs/envoy/latest/api-docs/xds_protocol#incremental-xds) by default. See upgrade notes for more information.
upgradeNotes:
  - title: Delta xDS on by default
    content: |
      In previous versions, Istio used the "State of the world" xDS protocol to configure Envoy.

		// Both SotW and Delta did not respond, nothing to compare
		return
	}
	newByName := slices.GroupUnique(sotwRes, (*discovery.Resource).GetName)
	curByName := slices.GroupUnique(current, (*discovery.Resource).GetName)

	watched := sets.New(w.ResourceNames...)

	details := fmt.Sprintf("last:%v sotw:%v delta:%v-%v", len(current), len(sotwRes), len(deltaRes), len(deleted))
	wantDeleted := sets.New[string]()

type DelayFunc func() time.Duration

// Timer takes an arbitrary delay function and returns a timer that can handle arbitrary interval changes.
// Use Backoff{...}.Timer() for simple delays and more efficient timers.
func (fn DelayFunc) Timer(c clock.Clock) Timer {
	return &variableTimer{fn: fn, new: c.NewTimer}
}

// Until takes an arbitrary delay function and runs until cancelled or the condition indicates exit. This

)

// appendPCDeltaCFA appends per-PC CFA deltas to b and returns the final slice.
func appendPCDeltaCFA(arch *sys.Arch, b []byte, deltapc, cfa int64) []byte {
	b = append(b, dwarf.DW_CFA_def_cfa_offset_sf)
	b = dwarf.AppendSleb128(b, cfa/dataAlignmentFactor)

	switch {
	case deltapc < 0x40:
		b = append(b, uint8(dwarf.DW_CFA_advance_loc+deltapc))
	case deltapc < 0x100:
		b = append(b, dwarf.DW_CFA_advance_loc1)

	for i := from; i <= to; i += step {
		baseline := measureSqr(i, nruns, lower)
		testval := measureSqr(i, nruns, upper)
		pos := baseline > testval
		delta := baseline - testval
		percent := delta * 100 / baseline
		fmt.Printf("words = %3d deltaT = %10s (%4d%%) is %s better: %v", i, delta, percent, upper, pos)
		if i == from {
			initPos = pos
		}
		if threshold == 0 && pos != initPos {
			threshold = i

func (d *delayQueue) Push(task Task) {
	d.pushInternal(&delayTask{do: task, runAt: time.Now()})
}

// PushDelayed will execute the task after waiting for the delay
func (d *delayQueue) PushDelayed(t Task, delay time.Duration) {
	task := &delayTask{do: t, runAt: time.Now().Add(delay)}
	d.pushInternal(task)
}

// pushInternal will enqueue the delayTask with retries.
func (d *delayQueue) pushInternal(task *delayTask) {
	select {

			return false
		}

		// The line number for constant pool entries doesn't really matter.
		// We set it to the line number of the preceding instruction so that
		// there are no deltas to encode in the pc-line tables.
		for q := c.blitrl; q != nil; q = q.Link {
			q.Pos = p.Pos
		}

		c.elitrl.Link = p.Link
		p.Link = c.blitrl