feat(go): expose runtime ingest metrics

go/vehicle-gateway/cmd/realtime-api/main_test.go

@@ -3,11 +3,13 @@ package main
 import (
 	"context"
 	"encoding/json"
+	"strings"
 	"testing"
 
 	"github.com/segmentio/kafka-go"
 
 	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/envelope"
+	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/metrics"
 )
 
 func TestProcessRealtimeMessageUsesUncancelledContextForUpdateAndCommit(t *testing.T) {
@@ -29,7 +31,7 @@ func TestProcessRealtimeMessageUsesUncancelledContextForUpdateAndCommit(t *testi
 	updater := &contextCheckingRealtimeUpdater{}
 	committer := &contextCheckingMessageCommitter{}
 
-	processRealtimeMessage(parent, discardRealtimeLogger{}, updater, committer, kafka.Message{Value: payload})
+	processRealtimeMessage(parent, discardRealtimeLogger{}, nil, updater, committer, kafka.Message{Value: payload})
 
 	if updater.ctxErr != nil {
 		t.Fatalf("updater saw cancelled context: %v", updater.ctxErr)
@@ -42,6 +44,42 @@ func TestProcessRealtimeMessageUsesUncancelledContextForUpdateAndCommit(t *testi
 	}
 }
 
+func TestProcessRealtimeMessageRecordsMetrics(t *testing.T) {
+	env := envelope.FrameEnvelope{
+		Protocol:     envelope.ProtocolJT808,
+		MessageID:    "0x0200",
+		Phone:        "13307795425",
+		EventTimeMS:  1782918600000,
+		ReceivedAtMS: 1782918600000,
+		ParseStatus:  envelope.ParseOK,
+	}
+	payload, err := json.Marshal(env)
+	if err != nil {
+		t.Fatal(err)
+	}
+	registry := metrics.NewRegistry()
+
+	processRealtimeMessage(
+		context.Background(),
+		discardRealtimeLogger{},
+		registry,
+		&contextCheckingRealtimeUpdater{},
+		&contextCheckingMessageCommitter{},
+		kafka.Message{Topic: "vehicle.event.go.unified.v1", Value: payload},
+	)
+
+	text := registry.Render()
+	for _, want := range []string{
+		`vehicle_realtime_kafka_messages_total{status="received",topic="vehicle.event.go.unified.v1"} 1`,
+		`vehicle_realtime_updates_total{status="ok",topic="vehicle.event.go.unified.v1"} 1`,
+		`vehicle_realtime_kafka_commits_total{status="ok",topic="vehicle.event.go.unified.v1"} 1`,
+	} {
+		if !strings.Contains(text, want) {
+			t.Fatalf("metrics missing %s:\n%s", want, text)
+		}
+	}
+}
+
 func TestCompositeRealtimeUpdaterUpdatesBothStores(t *testing.T) {
 	env := envelope.FrameEnvelope{Protocol: envelope.ProtocolGB32960, VIN: "VIN001"}
 	redisUpdater := &contextCheckingRealtimeUpdater{}