Expose arbitration pressure summary

cmd/sdrd/arbitration_snapshot.go

@@ -8,6 +8,7 @@ func buildArbitrationSnapshot(step pipeline.RefinementStep, arb pipeline.Arbitra
 		HoldPolicy:          &arb.HoldPolicy,
 		RefinementAdmission: &arb.Refinement,
 		Queue:               arb.Queue,
+		Pressure:            &arb.Pressure,
 		DecisionSummary:     summarizeDecisions(step.Result.Decisions),
 		DecisionItems:       compactDecisions(step.Result.Decisions),
 	}

cmd/sdrd/types.go

@@ -48,12 +48,13 @@ type DecisionDebug struct {
 }
 
 type ArbitrationSnapshot struct {
-	Budgets             *pipeline.BudgetModel         `json:"budgets,omitempty"`
-	HoldPolicy          *pipeline.HoldPolicy          `json:"hold_policy,omitempty"`
-	RefinementAdmission *pipeline.RefinementAdmission `json:"refinement_admission,omitempty"`
-	Queue               pipeline.DecisionQueueStats   `json:"queue,omitempty"`
-	DecisionSummary     decisionSummary               `json:"decision_summary,omitempty"`
-	DecisionItems       []compactDecision             `json:"decision_items,omitempty"`
+	Budgets             *pipeline.BudgetModel           `json:"budgets,omitempty"`
+	HoldPolicy          *pipeline.HoldPolicy            `json:"hold_policy,omitempty"`
+	RefinementAdmission *pipeline.RefinementAdmission   `json:"refinement_admission,omitempty"`
+	Queue               pipeline.DecisionQueueStats     `json:"queue,omitempty"`
+	Pressure            *pipeline.BudgetPressureSummary `json:"pressure,omitempty"`
+	DecisionSummary     decisionSummary                 `json:"decision_summary,omitempty"`
+	DecisionItems       []compactDecision               `json:"decision_items,omitempty"`
 }
 
 type SpectrumFrame struct {