So, behind the scenes, it will actually work as if everything was the same single app.

!!! check
    You don't have to worry about performance when including routers.

    This will take microseconds and will only happen at startup.

    So it won't affect performance. ⚡

### Include an `APIRouter` with a custom `prefix`, `tags`, `responses`, and `dependencies`

   *
   * <p>This always holds: {@code 0 <= permitsToTake <= storedPermits}
   */
  abstract long storedPermitsToWaitTime(double storedPermits, double permitsToTake);

  /**
   * Returns the number of microseconds during cool down that we have to wait to get a new permit.
   */
  abstract double coolDownIntervalMicros();

  /** Updates {@code storedPermits} and {@code nextFreeTicketMicros} based on the current time. */

	{"1.0040s", 1*Second + 4*Millisecond},
	{"100.00100s", 100*Second + 1*Millisecond},
	// different units
	{"10ns", 10 * Nanosecond},
	{"11us", 11 * Microsecond},
	{"12µs", 12 * Microsecond}, // U+00B5
	{"12μs", 12 * Microsecond}, // U+03BC
	{"13ms", 13 * Millisecond},
	{"14s", 14 * Second},
	{"15m", 15 * Minute},
	{"16h", 16 * Hour},
	// composite durations
	{"3h30m", 3*Hour + 30*Minute},

// binary format. The first words are a header with the following data:
//
//	1st word -- 0
//	2nd word -- 3
//	3rd word -- 0 if a c++ application, 1 if a java application.
//	4th word -- Sampling period (in microseconds).
//	5th word -- Padding.
func parseCPU(b []byte) (*Profile, error) {
	var parse func([]byte) (uint64, []byte)
	var n1, n2, n3, n4, n5 uint64
	for _, parse = range cpuInts {
		var tmp []byte

	name := t.Name()

	t.Run("runtime.lock", func(t *testing.T) {
		mus := make([]runtime.Mutex, 200)
		var needContention atomic.Int64
		delay := 100 * time.Microsecond // large relative to system noise, for comparison between clocks
		delayMicros := delay.Microseconds()

		// The goroutine that acquires the lock will only proceed when it
		// detects that its partner is contended for the lock. That will lead to

				})

				for apiName, latency := range disk.Metrics.LastMinute {
					metrics = append(metrics, MetricV2{
						Description:    getNodeDriveAPILatencyMD(),
						Value:          float64(latency.Avg().Microseconds()),
						VariableLabels: map[string]string{"drive": disk.DrivePath, "api": "storage." + apiName},
					})
				}
			}
		}

		metrics = append(metrics, MetricV2{

//
//	2009/01/23 01:23:23 message
//
// while flags Ldate | Ltime | Lmicroseconds | Llongfile produce,
//
//	2009/01/23 01:23:23.123123 /a/b/c/d.go:23: message
const (
	Ldate         = 1 << iota     // the date in the local time zone: 2009/01/23
	Ltime                         // the time in the local time zone: 01:23:23
	Lmicroseconds                 // microsecond resolution: 01:23:23.123123.  assumes Ltime.

	"time"

	"go.uber.org/atomic"

	"istio.io/istio/pkg/test/util/assert"
	"istio.io/istio/pkg/test/util/retry"
)

func TestOrdering(t *testing.T) {
	numValues := 1000

	q := NewQueue(1 * time.Microsecond)
	stop := make(chan struct{})
	defer close(stop)

	wg := sync.WaitGroup{}
	wg.Add(numValues)
	mu := sync.Mutex{}
	out := make([]int, 0)
	for i := 0; i < numValues; i++ {
		i := i

    class ModelWithDatetimeField(BaseModel):
        dt_field: datetime

        @field_serializer("dt_field")
        def serialize_datetime(self, dt_field: datetime):
            return dt_field.replace(microsecond=0, tzinfo=timezone.utc).isoformat()

    app = FastAPI()
    model = ModelWithDatetimeField(dt_field=datetime(2019, 1, 1, 8))

    @app.get("/model", response_model=ModelWithDatetimeField)
    def get_model():

		ID:       id,
		Time:     float64(from.end.UnixNano()) / float64(time.Microsecond),
		Phase:    phaseFlowStart,
		TID:      from.tid,
	})
	tc.t.writeEvent(&format.Event{
		Name:      from.name + " -> " + to.name,
		Category:  "flow", // TODO(matloob): Add Category to Flow?
		ID:        id,
		Time:      float64(to.start.UnixNano()) / float64(time.Microsecond),
		Phase:     phaseFlowEnd,
		TID:       to.tid,