t.Once.Do(func() {
		t.ttl = ttl
		t.updateFn = update
		t.opts = opts
	})
}

// Get will return a cached value or fetch a new one.
// Tf the Update function returns an error the value is forwarded as is and not cached.
func (t *Cache[T]) Get() (T, error) {
	v := t.valErr.Load()
	ttl := t.ttl
	vTime := t.lastUpdateMs.Load()
	tNow := time.Now().UnixMilli()
	if v != nil && tNow-vTime < ttl.Milliseconds() {

)

var (
	// De-facto standard header keys.
	xForwardedFor    = http.CanonicalHeaderKey("X-Forwarded-For")
	xForwardedHost   = http.CanonicalHeaderKey("X-Forwarded-Host")
	xForwardedPort   = http.CanonicalHeaderKey("X-Forwarded-Port")
	xForwardedProto  = http.CanonicalHeaderKey("X-Forwarded-Proto")
	xForwardedScheme = http.CanonicalHeaderKey("X-Forwarded-Scheme")
	xRealIP          = http.CanonicalHeaderKey("X-Real-IP")
)

var (

		{xForwardedScheme, "http", "http"},
		{xForwardedScheme, "HTTP", "http"},
		{forwarded, `For="[2001:db8:cafe::17]:4711`, ""},                    // No proto
		{forwarded, `for=192.0.2.43, for=198.51.100.17;proto=https`, ""},    // Multiple params, will be empty.
		{forwarded, `for=172.32.10.15; proto=https;by=127.0.0.1;`, "https"}, // Space before proto
		{forwarded, `for=192.0.2.60;proto=http;by=203.0.113.43`, "http"},    // Multiple params
	}

		}
	}

	var dataUsageInfo DataUsageInfo
	json := jsoniter.ConfigCompatibleWithStandardLibrary
	if err = json.Unmarshal(buf, &dataUsageInfo); err != nil {
		return DataUsageInfo{}, err
	}
	// For forward compatibility reasons, we need to add this code.
	if len(dataUsageInfo.BucketsUsage) == 0 {
		dataUsageInfo.BucketsUsage = make(map[string]BucketUsageInfo, len(dataUsageInfo.BucketSizes))

	UpdatedAt time.Time
}

func (l *lastDayTierStats) addStats(ts tierStats) {
	now := time.Now()
	l.forwardTo(now)

	nowIdx := now.Hour()
	l.Bins[nowIdx] = l.Bins[nowIdx].add(ts)
}

// forwardTo moves time to t, clearing entries between last update and t.
func (l *lastDayTierStats) forwardTo(t time.Time) {
	if t.IsZero() {
		t = time.Now()
	}

	since := t.Sub(l.UpdatedAt).Hours()

	return nil
}

// Step takes a string provided from a server (or just an empty string for the
// very first conversation step) and attempts to move the authentication
// conversation forward.  It returns a string to be sent to the server or an
// error if the server message is invalid.  Calling Step after a conversation
// completes is also an error.

// Forwarder forwards all incoming HTTP requests to configured transport.
type Forwarder struct {
	RoundTripper http.RoundTripper
	PassHost     bool
	Logger       func(error)
	ErrorHandler func(http.ResponseWriter, *http.Request, error)

	// internal variables
	rewriter *headerRewriter
}

// NewForwarder creates an instance of Forwarder based on the provided list of configuration options

		return fmt.Errorf("could not build port forwarder for prometheus: %v", err)
	}

	if err = fw.Start(); err != nil {
		return fmt.Errorf("failure running port forward process: %v", err)
	}

	// Close the forwarder either when we exit or when an this processes is interrupted.
	defer fw.Close()
	dashboard.ClosePortForwarderOnInterrupt(fw)

	log.Debugf("port-forward to prometheus pod ready")

			}
		case "FilterPrefix":
			z.FilterPrefix, err = dc.ReadString()
			if err != nil {
				err = msgp.WrapError(err, "FilterPrefix")
				return
			}
		case "ForwardTo":
			z.ForwardTo, err = dc.ReadString()
			if err != nil {
				err = msgp.WrapError(err, "ForwardTo")
				return
			}
		case "Limit":
			z.Limit, err = dc.ReadInt()
			if err != nil {
				err = msgp.WrapError(err, "Limit")
				return
			}

func (l *lastMinuteLatency) getTotal() AccElem {
	var res AccElem
	sec := time.Now().Unix()
	l.forwardTo(sec)
	for _, elem := range l.Totals[:] {
		res.merge(elem)
	}
	return res
}

// forwardTo time t, clearing any entries in between.
func (l *lastMinuteLatency) forwardTo(t int64) {
	if l.LastSec >= t {
		return
	}
	if t-l.LastSec >= 60 {
		l.Totals = [60]AccElem{}
		return
	}