feat: prevent no-op reconciles

There are edge cases where a reonciliation can be triggered on a
suspended Kustomization, mainly through changes in a source.
In these cases a "no-op" reconciliation occurs, which can be confusing
for the user. This returns early if the Kustomization ist suspended.

Signed-off-by: Norman Stetter <85173861+norman-zon@users.noreply.github.com>

Author: norman-zon

internal/controller/kustomization_controller.go

@@ -189,6 +189,11 @@ func (r *KustomizationReconciler) Reconcile(ctx context.Context, req ctrl.Reques
 		// Record Prometheus metrics.
 		r.Metrics.RecordDuration(ctx, obj, reconcileStart)
 
+		// Do not proceed if the Kustomization is suspended
+		if obj.Spec.Suspend {
+			return
+		}
+
 		// Log and emit success event.
 		if conditions.IsReady(obj) {
 			msg := fmt.Sprintf("Reconciliation finished in %s, next run in %s",