code: func (ct *costTracker) totalRecharge() uint64 {
  	ct.gfLock.RLock()
  	defer ct.gfLock.RUnlock()
  
  	return uint64(ct.gf * ct.utilTarget)
  }
docs: // totalRecharge returns the current total recharge parameter which is used by
  // flowcontrol.ClientManager and is scaled by the global cost factor