Add Network Controller test to check for Network Adapter that matches RestInterface property

src/SdnDiagnostics.psd1

@@ -164,6 +164,7 @@
         'Test-SdnMuxConnectionStateToRouter',
         'Test-SdnMuxConnectionStateToSlbManager',
         'Test-SdnNetworkControllerApiNameResolution',
+        'Test-SdnNetworkControllerNodeRestInterface',
         'Test-SdnResourceConfigurationState',
         'Test-SdnResourceProvisioningState',
         'Test-SdnServiceFabricApplicationHealth',

src/modules/SdnDiag.Health.Config.psd1

@@ -45,6 +45,11 @@
 
         # NETWORK CONTROLLER TESTS
 
+        'Test-SdnNetworkControllerNodeRestInterface' = @{
+            Description = "Network Controller node(s) are missing the Network Adapter that is required for the REST interface."
+            Impact = "Failover of the NB API will not occur if the Network Controller node(s) are missing the Network Adapter that is required for the REST interface."
+            PublicDocUrl = "https://learn.microsoft.com/en-us/powershell/module/networkcontroller/set-networkcontrollernode"
+        }
         'Test-SdnServiceFabricApplicationHealth' = @{
             Description = "Network Controller application with Service Fabric is not healthy."
             Impact = "Network Controller services and functionality may be impacted."

src/modules/SdnDiag.Health.psm1

@@ -1530,6 +1530,7 @@ function Debug-SdnNetworkController {
                 [string[]]$services_sf = $config_sf.properties.services.Keys
                 $healthReport.HealthTest += @(
                     Test-SdnDiagnosticsCleanupTaskEnabled -TaskName 'SDN Diagnostics Task'
+                    Test-SdnNetworkControllerNodeRestInterface
                     Test-SdnServiceState -ServiceName $services_sf
                     Test-SdnServiceFabricApplicationHealth
                     Test-SdnServiceFabricClusterHealth
@@ -2760,6 +2761,37 @@ function Test-SdnConfigurationState {
     }
 }
 
+function Test-SdnNetworkControllerNodeRestInterface {
+    <#
+        .SYNOPSIS
+            Validates that a Network Adapter on the Network Controller node exists that matches the RestInterface name.
+    #>
+
+    [CmdletBinding()]
+    param()
+
+    Confirm-IsNetworkController
+    if ($Global:SdnDiagnostics.EnvironmentInfo.ClusterConfigType -ieq 'FailoverCluster') {
+        throw New-Object System.NotSupportedException("This function is not applicable to Failover Cluster Network Controller.")
+    }
+
+    $sdnHealthTest = New-SdnHealthTest
+    try {
+        $node = Get-SdnNetworkControllerNode -Name $env:COMPUTERNAME -ErrorAction Stop
+        $netAdapter = Get-NetAdapter -Name $node.RestInterface -ErrorAction Ignore
+        if ($null -eq $netAdapter) {
+            $sdnHealthTest.Result = 'FAIL'
+            $sdnHealthTest.Remediation += "Ensure that the Network Adapter $($node.RestInterface) exists. Leverage 'Set-NetworkControllerNode to update the -RestInterface if original adapter is not available."
+        }
+    }
+    catch {
+        $_ | Trace-Exception
+        $sdnHealthTest.Result = 'FAIL'
+    }
+
+    return $sdnHealthTest
+}
+
 ###################################
 ##### MUX HEALTH VALIDATIONS ######
 ###################################