const auto [iter, inserted] = source_uses.emplace(
          itensor,
          TensorUse{/*first_use=*/ioperation, /*last_use=*/ioperation});
      if (!inserted) {
        // Otherwise, update last_use.
        iter->second.last_use = ioperation;
      }
    }
  }

  deltas.reserve(2 * source_uses.size());

  for (const auto& [itensor, source] : source_uses) {

    // The operation that makes the first use of this tensor.
    int first_use() const { return *operations.begin(); }

    // The operation that makes the last use of this tensor.
    int last_use() const { return *operations.rbegin(); }
  };

  // The operators.
  struct Operation {
    bool is_stateful = false;  // Results of an Operation can be rematerialized

	require.True(t, ok)
	assert.Equal(zero, container1.firstDetected)
	assert.Equal(zero, container1.lastUsed)
	container2, ok := manager.getImageRecord(imageID(1))
	require.True(t, ok)
	assert.Equal(zero, container2.firstDetected)
	assert.True(container2.lastUsed.Equal(withContainer.lastUsed))
}

func TestDetectImagesWithRemovedImages(t *testing.T) {
	ctx := context.Background()

		// Images that are currently in used were given a newer lastUsed.
		if image.lastUsed.Equal(freeTime) || image.lastUsed.After(freeTime) {
			klog.V(5).InfoS("Image ID was used too recently, not eligible for garbage collection", "imageID", image.id, "lastUsed", image.lastUsed, "freeTime", freeTime)
			continue
		}

		// Avoid garbage collect the image if the image is not old enough.

		// since the legacy token starts to track.
		lastUsed, ok := secret.Labels[serviceaccount.LastUsedLabelKey]
		if ok {
			_, err := time.Parse(dateFormat, lastUsed)
			if err != nil {
				// the lastUsed value is not well-formed thus we cannot determine it
				logger.Error(err, "Parsing lastUsed time", "secret", klog.KRef(secret.Namespace, secret.Name))
				continue
			}
			if lastUsed >= preserveUsedOnOrAfter {
				continue
			}

}

func (s *ScavengeIndex) SetEmpty(ci ChunkIdx) {
	s.i.setEmpty(chunkIdx(ci))
}

func CheckPackScavChunkData(gen uint32, inUse, lastInUse uint16, flags uint8) bool {
	sc0 := scavChunkData{
		gen:            gen,
		inUse:          inUse,
		lastInUse:      lastInUse,
		scavChunkFlags: scavChunkFlags(flags),
	}
	scp := sc0.pack()
	sc1 := unpackScavChunkData(scp)
	return sc0 == sc1
}

		// with no success refresh for too much time.
		if now.Sub(e.lastUsedTime) >= r.evictionDuration || now.Sub(e.lastRefreshedTime) >= r.evictionDuration {
			log.Infof("Removed cached JWT public key (lastRefreshed: %s, lastUsed: %s) from %q",
				e.lastRefreshedTime, e.lastUsedTime, k.issuer)
			r.keyEntries.Delete(k)
			return true
		}

		oldPubKey := e.pubKey
		// Increment the WaitGroup counter.
		wg.Add(1)