Score VPN scheduler pressure

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

@@ -253,6 +253,7 @@ type FabricFlowSchedulerSnapshot struct {
 	HighWatermark              int                       `json:"high_watermark"`
 	BackpressureActive         bool                      `json:"backpressure_active"`
 	PressureLevel              string                    `json:"pressure_level,omitempty"`
+	PressureScore              int                       `json:"pressure_score,omitempty"`
 	PressureReasons            []string                  `json:"pressure_reasons,omitempty"`
 	InFlight                   int                       `json:"in_flight"`
 	MaxInFlight                int                       `json:"max_in_flight"`
@@ -862,12 +863,13 @@ func (s *FabricFlowScheduler) Snapshot() FabricFlowSchedulerSnapshot {
 			snapshot.AdaptiveBackpressureReason = "bulk_window_reduced_to_protect_interactive"
 		}
 	}
-	snapshot.PressureLevel, snapshot.PressureReasons = fabricFlowSchedulerPressure(snapshot)
+	snapshot.PressureLevel, snapshot.PressureScore, snapshot.PressureReasons = fabricFlowSchedulerPressure(snapshot)
 	return snapshot
 }
 
-func fabricFlowSchedulerPressure(snapshot FabricFlowSchedulerSnapshot) (string, []string) {
+func fabricFlowSchedulerPressure(snapshot FabricFlowSchedulerSnapshot) (string, int, []string) {
 	level := "nominal"
+	score := 0
 	reasons := []string{}
 	addReason := func(reason string) {
 		reason = strings.TrimSpace(reason)
@@ -888,33 +890,43 @@ func fabricFlowSchedulerPressure(snapshot FabricFlowSchedulerSnapshot) (string,
 	}
 	if snapshot.Dropped > 0 || snapshot.QualityWindowDropCount > 0 {
 		escalate("critical")
+		score += boundedFabricPressureScore(int(snapshot.Dropped)+snapshot.QualityWindowDropCount*10, 20, 40)
 		addReason("drops")
 	}
 	if snapshot.FailingChannelCount > 0 || snapshot.QualityWindowFailureCount > 0 {
 		escalate("critical")
+		score += boundedFabricPressureScore((snapshot.FailingChannelCount+snapshot.QualityWindowFailureCount)*10, 20, 40)
 		addReason("route_failures")
 	}
 	if snapshot.RouteRecoveredChannelCount > 0 || snapshot.RouteSwitchCount > 0 {
 		escalate("warning")
+		score += boundedFabricPressureScore(snapshot.RouteRecoveredChannelCount*8+int(snapshot.RouteSwitchCount)*4, 8, 24)
 		addReason("route_recovery")
 	}
 	if snapshot.SlowChannelCount > 0 || snapshot.QualityWindowSlowCount > 0 {
 		escalate("warning")
+		score += boundedFabricPressureScore((snapshot.SlowChannelCount+snapshot.QualityWindowSlowCount)*6, 6, 24)
 		addReason("slow_channels")
 	}
 	if snapshot.BulkPressureActive {
 		escalate("warning")
+		score += 15
 		addReason("bulk_pressure")
 	}
 	if snapshot.AdaptiveBackpressureActive {
 		escalate("warning")
+		score += 10
 		addReason(snapshot.AdaptiveBackpressureReason)
 	}
 	if snapshot.BackpressureActive {
 		escalate("warning")
+		score += 10
 		addReason("backpressure")
 	}
-	return level, reasons
+	if score > 100 {
+		score = 100
+	}
+	return level, score, reasons
 }
 
 func flowPressureRank(level string) int {
@@ -928,6 +940,16 @@ func flowPressureRank(level string) int {
 	}
 }
 
+func boundedFabricPressureScore(value, minValue, maxValue int) int {
+	if value < minValue {
+		return minValue
+	}
+	if value > maxValue {
+		return maxValue
+	}
+	return value
+}
+
 func (s *FabricFlowScheduler) recommendedParallelSendWindowForTrafficClassLocked(trafficClass string, maxWindow int) int {
 	if maxWindow <= 1 {
 		return 1

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

@@ -789,8 +789,8 @@ func TestFabricFlowSchedulerDropsWhenChannelQueueIsFull(t *testing.T) {
 	if snapshot.Dropped != 1 || !snapshot.BackpressureActive {
 		t.Fatalf("snapshot = %+v, want one dropped packet and active backpressure", snapshot)
 	}
-	if snapshot.PressureLevel != "critical" || !containsString(snapshot.PressureReasons, "drops") {
-		t.Fatalf("pressure = %s/%v, want critical drops", snapshot.PressureLevel, snapshot.PressureReasons)
+	if snapshot.PressureLevel != "critical" || snapshot.PressureScore <= 0 || !containsString(snapshot.PressureReasons, "drops") {
+		t.Fatalf("pressure = %s score=%d reasons=%v, want critical drops", snapshot.PressureLevel, snapshot.PressureScore, snapshot.PressureReasons)
 	}
 }
 
@@ -1548,9 +1548,10 @@ func TestFabricClientPacketIngressIsolatesRouteFailoverPerLogicalChannel(t *test
 		t.Fatalf("route recovery telemetry = stat:%+v scheduler:%+v", statA, snapshot.FlowScheduler)
 	}
 	if snapshot.FlowScheduler.PressureLevel != "critical" ||
+		snapshot.FlowScheduler.PressureScore <= 0 ||
 		!containsString(snapshot.FlowScheduler.PressureReasons, "route_recovery") ||
 		!containsString(snapshot.FlowScheduler.PressureReasons, "route_failures") {
-		t.Fatalf("route recovery pressure = %s/%v", snapshot.FlowScheduler.PressureLevel, snapshot.FlowScheduler.PressureReasons)
+		t.Fatalf("route recovery pressure = %s score=%d reasons=%v", snapshot.FlowScheduler.PressureLevel, snapshot.FlowScheduler.PressureScore, snapshot.FlowScheduler.PressureReasons)
 	}
 	if statB.LastRouteID != "route-primary" || statB.LastFailedRouteID != "" || statB.ConsecutiveFailures != 0 {
 		t.Fatalf("channel B stat = %+v, want primary route memory preserved", statB)
@@ -1919,8 +1920,8 @@ func TestFabricFlowSchedulerProtectsInteractiveWindowDuringBulkPressure(t *testi
 	if !snapshot.BulkPressureActive || snapshot.BulkPressureChannelCount != 16 || snapshot.InteractiveOrControlCount != 1 || !snapshot.BackpressureActive {
 		t.Fatalf("bulk pressure telemetry = %+v", snapshot)
 	}
-	if snapshot.PressureLevel != "warning" || !containsString(snapshot.PressureReasons, "bulk_pressure") {
-		t.Fatalf("pressure = %s/%v, want warning bulk pressure", snapshot.PressureLevel, snapshot.PressureReasons)
+	if snapshot.PressureLevel != "warning" || snapshot.PressureScore <= 0 || !containsString(snapshot.PressureReasons, "bulk_pressure") {
+		t.Fatalf("pressure = %s score=%d reasons=%v, want warning bulk pressure", snapshot.PressureLevel, snapshot.PressureScore, snapshot.PressureReasons)
 	}
 }