code: func (t *TombstoneGC) SetEnabled(enabled bool) {
  	t.Lock()
  	defer t.Unlock()
  	if enabled == t.enabled {
  		return
  	}
  
  	// Stop all the timers and clear
  	if !enabled {
  		for _, exp := range t.expires {
  			exp.timer.Stop()
  		}
  		t.expires = make(map[time.Time]*expireInterval)
  	}
  
  	// Update the status
  	t.enabled = enabled
  }
docs: // SetEnabled is used to control if the tombstone GC is
  // enabled. Should only be enabled by the leader node.