code: func NonSlidingUntil(f func(), period time.Duration, stopCh <-chan struct{}) {
  	JitterUntil(f, period, 0.0, false, stopCh)
  }
docs: // NonSlidingUntil loops until stop channel is closed, running f every
  // period.
  //
  // NonSlidingUntil is syntactic sugar on top of JitterUntil with zero jitter
  // factor, with sliding = false (meaning the timer for period starts at the same
  // time as the function starts).