Measure VPN route recovery time

agents/rap-node-agent/internal/vpnruntime/fabric_transport_test.go

@@ -1533,7 +1533,9 @@ func TestFabricClientPacketIngressIsolatesRouteFailoverPerLogicalChannel(t *test
 	if statA.LastRecoveredFromRouteID != "route-primary" ||
 		statA.LastRecoveredNextHop != "relay-primary" ||
 		statA.RouteSwitchCount != 1 ||
+		statA.LastRouteFailureAt == "" ||
 		statA.LastRouteSwitchAt == "" ||
+		statA.LastRouteRecoveryMillis < 0 ||
 		snapshot.FlowScheduler.RouteRecoveredChannelCount != 1 ||
 		snapshot.FlowScheduler.RouteSwitchCount != 1 {
 		t.Fatalf("route recovery telemetry = stat:%+v scheduler:%+v", statA, snapshot.FlowScheduler)