type scannerMetrics struct {
	// All fields must be accessed atomically and aligned.
	operations [scannerMetricLast]uint64
	latency    [scannerMetricLastRealtime]lockedLastMinuteLatency

	// actions records actions performed.
	actions        [lifecycle.ActionCount]uint64
	actionsLatency [lifecycle.ActionCount]lockedLastMinuteLatency

	// currentPaths contains (string,*currentPathTracker) for each disk processing.

func ifModifiedSince(objTime time.Time, givenTime time.Time) bool {
	// The Date-Modified header truncates sub-second precision, so
	// use mtime < t+1s instead of mtime <= t to check for unmodified.
	return !objTime.Before(givenTime.Add(1 * time.Second))
}

// canonicalizeETag returns ETag with leading and trailing double-quotes removed,
// if any present

	// This goroutine owns the cache.
	var saverWg sync.WaitGroup
	saverWg.Add(1)
	go func() {
		// Add jitter to the update time so multiple sets don't sync up.
		updateTime := 30*time.Second + time.Duration(float64(10*time.Second)*rand.Float64())
		t := time.NewTicker(updateTime)
		defer t.Stop()
		defer saverWg.Done()
		var lastSave time.Time

		for {
			select {
			case <-t.C:

    /**
     * Registers the specified cache record for usage with the given project. Integrators can use the information
     * collected from this method in combination with a custom cache implementation to dispose unused records from the
     * cache.
     *
     * @param project The project that employs the plugin realm, must not be {@code null}.
     * @param record The cache record being used for the project, must not be {@code null}.
     */

    /**
     * Registers the specified cache record for usage with the given project. Integrators can use the information
     * collected from this method in combination with a custom cache implementation to dispose unused records from the
     * cache.
     *
     * @param project The project that employs the plugin realm, must not be {@code null}.
     * @param record The cache record being used for the project, must not be {@code null}.
     */

    frame.writeByte(Http2.TYPE_HEADERS)
    frame.writeByte(FLAG_END_HEADERS or FLAG_END_STREAM)
    frame.writeInt(expectedStreamId and 0x7fffffff)
    frame.writeAll(headerBytes)

    // Check writer sends the same bytes.
    assertThat(sendHeaderFrames(true, sentHeaders)).isEqualTo(frame)
    reader.nextFrame(
      requireSettings = false,
      object : BaseTestHandler() {
        override fun headers(

        if ((duration.getSeconds() | duration.getNano()) > 0) { // duration.isPositive()
            long bytesPerSecond = Math.round(contentLength / (double) duration.toSeconds());
            message.append(" at ");
            format.format(message, bytesPerSecond);
            message.append("/s");
        }

        message.append(')');
        out.info(message.toString());
    }

    /**
     * Registers the specified cache record for usage with the given project. Integrators can use the information
     * collected from this method in combination with a custom cache implementation to dispose unused records from the
     * cache.
     *
     * @param project The project that employs the plugin realm, must not be {@code null}.
     * @param record The cache record being used for the project, must not be {@code null}.
     */

// Mask returns the type as mask.
func (e Event) Mask() uint64 {
	return e.EventName.Mask()
}

// Log represents event information for some event targets.
type Log struct {
	EventName Name
	Key       string
	Records   []Event

	var allVersionIDs, freeVersionIDs []string
	for i := range 5 {
		fi := basefi
		fi.VersionID = mustGetUUID()
		fi.DataDir = mustGetUUID()
		fi.ModTime = basefi.ModTime.Add(time.Duration(i) * time.Second)
		if err := xl.AddVersion(fi); err != nil {
			t.Fatalf("%d: Failed to add version %v", i+1, err)
		}

		if i > 3 {
			// Simulate transition of a version
			transfi := fi