if dsecs == "" {
		return defaultExpiry, nil
	}

	d, err := strconv.Atoi(dsecs)
	if err != nil {
		return 0, auth.ErrInvalidDuration
	}

	dur := time.Duration(d) * time.Second

	if dur < minExpiry || dur > maxExpiry {
		return 0, auth.ErrInvalidDuration
	}
	return dur, nil
}

// Lookup returns a new Config by merging the given K/V config
// system with environment variables.

	if d == "" {
		d = env.Get("_MINIO_DRIVE_MAX_TIMEOUT", "")
		if d == "" {
			d = env.Get("_MINIO_DISK_MAX_TIMEOUT", "")
		}
	}

	dur, _ := time.ParseDuration(d)
	if dur < time.Second {
		cfg.MaxTimeout = 30 * time.Second
	} else {
		cfg.MaxTimeout = getMaxTimeout(dur)
	}
	return cfg, err
}

func getMaxTimeout(t time.Duration) time.Duration {
	if t < time.Second {
		// get default value

// previous results
func (dt *dynamicTimeout) adjust(entries [dynamicTimeoutLogSize]time.Duration) {
	failures, max := 0, time.Duration(0)
	for _, dur := range entries[:] {
		if dur == maxDuration {
			failures++
		} else if dur > max {
			max = dur
		}
	}

	failPct := float64(failures) / float64(len(entries))

	if failPct > dynamicTimeoutIncreaseThresholdPct {

type AccElem struct {
	Total int64
	Size  int64
	N     int64
}

// Add a duration to a single element.
func (a *AccElem) add(dur time.Duration) {
	if dur < 0 {
		dur = 0
	}
	a.Total += int64(dur)
	a.N++
}

// Merge b into a.
func (a *AccElem) merge(b AccElem) {
	a.N += b.N
	a.Total += b.Total
	a.Size += b.Size
}

// Avg returns average time spent.

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		return l.stsExpiryDuration, nil
	}

	d, err := strconv.Atoi(dsecs)
	if err != nil {
		return 0, auth.ErrInvalidDuration
	}

	dur := time.Duration(d) * time.Second

	if dur < minLDAPExpiry || dur > maxLDAPExpiry {
		return 0, auth.ErrInvalidDuration
	}
	return dur, nil
}

// ParsesAsDN determines if the given string could be a valid DN based on
// parsing alone.

out the Fish-Footman was gone, and the other was sitting on the
ground near the door, staring stupidly up into the sky.

  Alice went timidly up to the door, and knocked.

  `There's no sort of use in knocking,' said the Footman, `and
that for two reasons.  First, because I'm on the same side of the
door as you are; secondly, because they're making such a noise

out the Fish-Footman was gone, and the other was sitting on the
ground near the door, staring stupidly up into the sky.

  Alice went timidly up to the door, and knocked.

  `There's no sort of use in knocking,' said the Footman, `and
that for two reasons.  First, because I'm on the same side of the
door as you are; secondly, because they're making such a noise

func healingMetricsPrometheus(ch chan<- prometheus.Metric) {
	bgSeq, exists := globalBackgroundHealState.getHealSequenceByToken(bgHealingUUID)
	if !exists {
		return
	}

	var dur time.Duration
	if !bgSeq.lastHealActivity.IsZero() {
		dur = time.Since(bgSeq.lastHealActivity)
	}

	ch <- prometheus.MustNewConstMetric(
		prometheus.NewDesc(
			prometheus.BuildFQName(healMetricsNamespace, "time", "since_last_activity"),

		Buckets: []float64{0.01, 0.1, 1, 2, 5, 10, 60, 5 * 60, 15 * 60, 30 * 60},
	}, []string{"tier"}),
}

func (t *tierMetrics) Observe(tier string, dur time.Duration) {
	t.histogram.With(prometheus.Labels{"tier": tier}).Observe(dur.Seconds())
}

func (t *tierMetrics) logSuccess(tier string) {
	t.Lock()
	defer t.Unlock()

	stat := t.requestsCount[tier]
	stat.success++