Fix Machine status if infra/bootstrap obj deleted

controllers/machine_controller_phases.go

@@ -78,6 +78,14 @@ func (r *MachineReconciler) reconcileExternal(ctx context.Context, m *clusterv1.
 	obj, err := external.Get(r.Client, ref, m.Namespace)
 	if err != nil {
 		if apierrors.IsNotFound(err) {
+			if m.Status.InfrastructureReady {
+				// Infra object went missing after the machine was up and running
+				r.Log.Error(err, "Infrastructure or bootstrap object went missing. Updating Machine Status")
+				machineStatusError := capierrors.MachineStatusError("InvalidConfiguration")
+				m.Status.ErrorReason = &machineStatusError
+				m.Status.ErrorMessage = pointer.StringPtr(fmt.Sprintf("Failure detected from referenced resource %v with name %q",
+				ref.GroupVersionKind(), ref.Name))
+			}
 			return nil, errors.Wrapf(&capierrors.RequeueAfterError{RequeueAfter: externalReadyWait},
 				"could not find %v %q for Machine %q in namespace %q, requeuing",
 				ref.GroupVersionKind(), ref.Name, m.Name, m.Namespace)