ctx, cancel := globalLeaderLock.GetLock(ctx)
	defer cancel()

	healTimer := time.NewTimer(siteHealTimeInterval)
	defer healTimer.Stop()

	var maxRefreshDurationSecondsForLog float64 = 10 // 10 seconds..

	for {
		select {
		case <-healTimer.C:
			c.RLock()
			enabled := c.enabled
			c.RUnlock()
			if enabled {
				refreshStart := time.Now()

    *   Added new op: `tf.strings.unsorted_segment_join`.
    *   Added HW acceleration support for `topK_v2`.
    *   CloudBigtable version updated to v0.10.0 BEGIN_PUBLIC CloudBigtable
        version updated to v0.10.0.
    *   Expose `Head` as public API.
    *   Added `tf.sparse.from_dense` utility function.
    *   Improved ragged tensor support in `TensorFlowTestCase`.