code: func (a *Agent) DisableServiceMaintenance(serviceID string) error {
  	if _, ok := a.State.Services()[serviceID]; !ok {
  		return fmt.Errorf("No service registered with ID %q", serviceID)
  	}
  
  	// Check if maintenance mode is enabled
  	checkID := serviceMaintCheckID(serviceID)
  	if _, ok := a.State.Checks()[checkID]; !ok {
  		return nil
  	}
  
  	// Deregister the maintenance check
  	a.RemoveCheck(checkID, true)
  	a.logger.Printf("[INFO] agent: Service %q left maintenance mode", serviceID)
  
  	return nil
  }
docs: // DisableServiceMaintenance will deregister the fake maintenance mode check
  // if the service has been marked as in maintenance.