bf2.go

package main

import (
	"github.com/go-logr/logr"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/controller"
	"sigs.k8s.io/controller-runtime/pkg/handler"
	"sigs.k8s.io/controller-runtime/pkg/source"
)

type MyController struct {
	client.Client
	log logr.Logger
}

func (c *MyController) Reconcile(req controller.Request) (controller.Result, error) {
	// your logic here
}

func main() {
	builder := controller.NewControllerManagedBy(mgr).
		For(&MyType{}).
		Watches(&source.Kind{Type: &appsv1.Deployment{}}, &handler.EnqueueRequestForOwner{
			IsController: true,
			OwnerType:    &MyType{},
		})

	if err := builder.Complete(mgr); err != nil {
		log.Error(err, "unable to create controller")
		os.Exit(1)
	}
}