Ignore VMs in vmss delete backend pools

Signed-off-by: ialidzhikov <i.alidjikov@gmail.com>

staging/src/k8s.io/legacy-cloud-providers/azure/azure_vmss.go

@@ -1558,7 +1558,7 @@ func (ss *scaleSet) EnsureBackendPoolDeleted(service *v1.Service, backendPoolID,
 
 	hostUpdates := make([]func() error, 0, len(ipConfigurationIDs))
 	nodeUpdates := make(map[vmssMetaInfo]map[string]compute.VirtualMachineScaleSetVM)
-	errors := make([]error, 0)
+	allErrs := make([]error, 0)
 	for i := range ipConfigurationIDs {
 		ipConfigurationID := ipConfigurationIDs[i]
 
@@ -1578,14 +1578,16 @@ func (ss *scaleSet) EnsureBackendPoolDeleted(service *v1.Service, backendPoolID,
 			}
 
 			klog.Errorf("Failed to GetNodeNameByIPConfigurationID(%s): %v", ipConfigurationID, err)
-			errors = append(errors, err)
+			allErrs = append(allErrs, err)
 			continue
 		}
 
 		nodeResourceGroup, nodeVMSS, nodeInstanceID, nodeVMSSVM, err := ss.ensureBackendPoolDeletedFromNode(nodeName, backendPoolID)
 		if err != nil {
-			klog.Errorf("EnsureBackendPoolDeleted(%s): backendPoolID(%s) - failed with error %v", getServiceName(service), backendPoolID, err)
-			errors = append(errors, err)
+			if !errors.Is(err, ErrorNotVmssInstance) { // Do nothing for the VMAS nodes.
+				klog.Errorf("EnsureBackendPoolDeleted(%s): backendPoolID(%s) - failed with error %v", getServiceName(service), backendPoolID, err)
+				allErrs = append(allErrs, err)
+			}
 			continue
 		}
 
@@ -1631,8 +1633,8 @@ func (ss *scaleSet) EnsureBackendPoolDeleted(service *v1.Service, backendPoolID,
 	}
 
 	// Fail if there are other errors.
-	if len(errors) > 0 {
-		return utilerrors.Flatten(utilerrors.NewAggregate(errors))
+	if len(allErrs) > 0 {
+		return utilerrors.Flatten(utilerrors.NewAggregate(allErrs))
 	}
 
 	// Ensure the backendPoolID is also deleted on VMSS itself.