Use structured log for karmada operator (#6564)

* use structured log

Signed-off-by: zhangsquared <[email protected]>

* addressing comment

Signed-off-by: zhangsquared <[email protected]>

---------

Signed-off-by: zhangsquared <[email protected]>

Author: zhangsquared

operator/pkg/controller/karmada/controller.go

@@ -97,7 +97,7 @@ func (ctrl *Controller) Reconcile(ctx context.Context, req controllerruntime.Req
 	}
 
 	if err := ctrl.validateKarmada(ctx, karmada); err != nil {
-		klog.Errorf("Validation failed for karmada: %+v", err)
+		klog.ErrorS(err, "Validation failed for karmada", "name", karmada.Name)
 		return controllerruntime.Result{}, nil
 	}
 

operator/pkg/controller/karmada/validating.go

@@ -80,7 +80,7 @@ func validateETCD(etcd *operatorv1alpha1.Etcd, karmadaName string, fldPath *fiel
 		replicas := *etcd.Local.CommonSettings.Replicas
 
 		if (replicas % 2) == 0 {
-			klog.Warningf("invalid etcd replicas %d, expected an odd number", replicas)
+			klog.InfoS("Using an even number of etcd replicas is not recommended", "replicas", replicas)
 		}
 	}