code: func NewServiceChangeTracker(makeServiceInfo makeServicePortFunc, isIPv6Mode *bool, recorder record.EventRecorder) *ServiceChangeTracker {
  	return &ServiceChangeTracker{
  		items:           make(map[types.NamespacedName]*serviceChange),
  		makeServiceInfo: makeServiceInfo,
  		isIPv6Mode:      isIPv6Mode,
  		recorder:        recorder,
  	}
  }
docs: // NewServiceChangeTracker initializes a ServiceChangeTracker