feat: build vehicle data platform and production pipeline

go/vehicle-gateway/internal/gateway/identity_metrics_test.go

@@ -0,0 +1,27 @@
+package gateway
+
+import (
+	"strings"
+	"testing"
+
+	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/envelope"
+	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/metrics"
+)
+
+func TestRecordGatewayIdentityCacheStatus(t *testing.T) {
+	registry := metrics.NewRegistry()
+	recordGatewayIdentityCacheStatus(registry, envelope.ProtocolJT808, envelope.FrameEnvelope{
+		Parsed: map[string]any{
+			"identity": map[string]any{
+				"resolved":     true,
+				"cache_status": "stale",
+			},
+		},
+	})
+
+	got := registry.Render()
+	want := `vehicle_gateway_identity_cache_total{cache_status="stale",protocol="JT808"} 1`
+	if !strings.Contains(got, want) {
+		t.Fatalf("metrics missing %q:\n%s", want, got)
+	}
+}