feat(gl): add standalone ledger authority mode

application/health/service.go

@@ -15,6 +15,10 @@ type SettlementMonitor interface {
 	Stats(context.Context) (ledger.SettlementStats, error)
 }
 
+type SettlementAuthority interface {
+	SettlementAllowed(context.Context) (bool, error)
+}
+
 type Status struct {
 	Serving           bool
 	DatabaseReady     bool
@@ -50,6 +54,10 @@ func (s *Service) Check(ctx context.Context) Status {
 		if err == nil {
 			status.SettlementStats = stats
 			status.SettlementReady = true
+			if authority, ok := s.settlement.(SettlementAuthority); ok {
+				allowed, authorityErr := authority.SettlementAllowed(ctx)
+				status.SettlementReady = authorityErr == nil && allowed
+			}
 		}
 	}
 	return status