package main

import (
	"fmt"
	"os"

	// Note that Kubernetes registers workqueue metrics to default prometheus Registry. And the registry will be
	// initialized by the package 'k8s.io/apiserver/pkg/server'.
	// See https://github.com/kubernetes/kubernetes/blob/f61ed439882e34d9dad28b602afdc852feb2337a/staging/src/k8s.io/component-base/metrics/prometheus/workqueue/metrics.go#L25
	// But the controller-runtime registers workqueue metrics to its own Registry instead of default prometheus Registry.
	// See https://github.com/kubernetes-sigs/controller-runtime/blob/4d10a0615b11507451ecb58bfd59f0f6ef313a29/pkg/metrics/workqueue.go#L24-L26
	// However, global workqueue metrics factory will be only initialized once.
	// See https://github.com/kubernetes/kubernetes/blob/f61ed439882e34d9dad28b602afdc852feb2337a/staging/src/k8s.io/client-go/util/workqueue/metrics.go#L257-L261
	// So this package should be initialized before 'k8s.io/apiserver/pkg/server', thus the internal registry of
	// controller-runtime could be set first.
	_ "sigs.k8s.io/controller-runtime/pkg/metrics"

	apiserver "k8s.io/apiserver/pkg/server"
	"k8s.io/component-base/logs"

	"github.com/karmada-io/karmada/cmd/controller-manager/app"
)

// Controller-manager main.
func main() {
	logs.InitLogs()
	defer logs.FlushLogs()

	ctx := apiserver.SetupSignalContext()

	if err := app.NewControllerManagerCommand(ctx).Execute(); err != nil {
		fmt.Fprintf(os.Stderr, "%v\n", err)
		os.Exit(1)
	}
}