GH-35 randomize validation reconcilation

internal/controller/dnsrecord_controller.go

@@ -28,6 +28,7 @@ import (
 	"k8s.io/apimachinery/pkg/api/meta"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/util/rand"
 	"k8s.io/utils/clock"
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/client"
@@ -48,7 +49,7 @@ const (
 
 var (
 	defaultRequeueTime    time.Duration
-	validationRequeueTime = time.Second * 5
+	validationRequeueTime = time.Millisecond * 5000
 	validFor              time.Duration
 	reconcileStart                    = metav1.Time{}
 	Clock                 clock.Clock = clock.RealClock{}
@@ -69,6 +70,13 @@ func (r *DNSRecordReconciler) Reconcile(ctx context.Context, req ctrl.Request) (
 	logger := log.FromContext(ctx)
 
 	reconcileStart = metav1.Now()
+
+	// randomize validation reconcile delay
+	seconds := float64(validationRequeueTime.Milliseconds())
+	validationRequeueTime = time.Millisecond * time.Duration(rand.Int63nRange(
+		int64(seconds*0.9),
+		int64(seconds*1.1)))
+
 	previous := &v1alpha1.DNSRecord{}
 	err := r.Client.Get(ctx, client.ObjectKey{Namespace: req.Namespace, Name: req.Name}, previous)
 	if err != nil {