Implement simple endpoint slice batching

Kubernetes-commit: 49b11b5431d01cf9ac954b97cbec51e92d33c7f6

config/v1alpha1/types.go

@@ -312,6 +312,11 @@ type EndpointSliceControllerConfiguration struct {
 	// added to an EndpointSlice. More endpoints per slice will result in fewer
 	// and larger endpoint slices, but larger resources.
 	MaxEndpointsPerSlice int32
+
+	// EndpointUpdatesBatchPeriod describes the length of endpoint updates batching period.
+	// Processing of pod changes will be delayed by this duration to join them with potential
+	// upcoming updates and reduce the overall number of endpoints updates.
+	EndpointUpdatesBatchPeriod metav1.Duration
 }
 
 // GarbageCollectorControllerConfiguration contains elements describing GarbageCollectorController.

config/v1alpha1/zz_generated.deepcopy.go

@@ -143,6 +143,7 @@ func (in *EndpointControllerConfiguration) DeepCopy() *EndpointControllerConfigu
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *EndpointSliceControllerConfiguration) DeepCopyInto(out *EndpointSliceControllerConfiguration) {
 	*out = *in
+	out.EndpointUpdatesBatchPeriod = in.EndpointUpdatesBatchPeriod
 	return
 }