BUG: ignore IsNotFound error when trying to scale down deployment

We can safely ignore IsNotFound errors when
the oeprator triyes to scale down the descheduler
deployment as the result of a bad configuration.
This could happen for instance if this is the first
configuration attempt and the deployment has never
been created before.
In this way the operator can continue and succefully
report the error condition.

Signed-off-by: Simone Tiraboschi <[email protected]>

Author: tiraboschi

pkg/operator/target_config_reconciler.go

@@ -35,6 +35,7 @@ import (
 	autoscalingv1 "k8s.io/api/autoscaling/v1"
 	v1 "k8s.io/api/core/v1"
 	rbacv1 "k8s.io/api/rbac/v1"
+	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	"k8s.io/apimachinery/pkg/runtime"
@@ -176,7 +177,7 @@ func (c TargetConfigReconciler) sync() error {
 					},
 				},
 				metav1.UpdateOptions{})
-			if err != nil {
+			if err != nil && !errors.IsNotFound(err) {
 				return err
 			}
 			_, _, err = v1helpers.UpdateStatus(c.ctx, c.deschedulerClient,