Preserve named guest interfaces without MACs (#1319)

internal/monitoring/guest_metadata.go

@@ -611,9 +611,9 @@ func processGuestNetworkInterfaces(raw []proxmox.VMNetworkInterface) ([]string,
 			if ifaceName == "" || lowerName == "lo" || lowerName == "loopback" {
 				continue
 			}
-			if mac == "" || mac == "00:00:00:00:00:00" {
-				continue
-			}
+			// Preserve named non-loopback interfaces even when early/partial guest-agent
+			// payloads have not populated MAC or IP details yet. The interface identity
+			// is still useful for the VM Summary view and should not wait for a later poll.
 		}
 
 		guestIfaces = append(guestIfaces, models.GuestNetworkInterface{

internal/monitoring/guest_metadata_test.go

@@ -557,6 +557,21 @@ func TestProcessGuestNetworkInterfaces(t *testing.T) {
 				{Name: "eth0", MAC: "00:11:22:33:44:55", Addresses: nil},
 			},
 		},
+		{
+			name: "interface with name only still keeps non-loopback identity",
+			raw: []proxmox.VMNetworkInterface{
+				{
+					Name:         "Ethernet 2",
+					HardwareAddr: "",
+					IPAddresses:  nil,
+					Statistics:   nil,
+				},
+			},
+			wantIPs: []string{},
+			wantIfaces: []models.GuestNetworkInterface{
+				{Name: "Ethernet 2", MAC: "", Addresses: nil},
+			},
+		},
 		{
 			name: "loopback-only interface with no IPs and no traffic is excluded",
 			raw: []proxmox.VMNetworkInterface{