feat: 建立可观测性、容量与恢复验证基线

server-go/internal/service/ai_client.go

@@ -77,6 +77,7 @@ func NewAIClient(baseURL string) *AIClient {
 
 // Detect 上传图片到 ai-service /detect，返回检测结果（无状态接口，天然幂等）
 func (c *AIClient) Detect(ctx context.Context, imageBytes []byte, filename string) (*AIDetectResponse, error) {
+	start := time.Now()
 	var body bytes.Buffer
 	writer := multipart.NewWriter(&body)
 	part, err := writer.CreateFormFile("file", filename)
@@ -97,7 +98,9 @@ func (c *AIClient) Detect(ctx context.Context, imageBytes []byte, filename strin
 	req.Header.Set("Content-Type", writer.FormDataContentType())
 
 	resp, err := c.client.Do(req)
+	latency := time.Since(start)
 	if err != nil {
+		RecordDependency(DependencyAI, err, latency)
 		return nil, err
 	}
 	defer resp.Body.Close()
@@ -107,12 +110,16 @@ func (c *AIClient) Detect(ctx context.Context, imageBytes []byte, filename strin
 		return nil, err
 	}
 	if resp.StatusCode != http.StatusOK {
-		return nil, fmt.Errorf("ai-service /detect 返回 %d: %s", resp.StatusCode, string(data))
+		err := fmt.Errorf("ai-service /detect 返回 %d: %s", resp.StatusCode, string(data))
+		RecordDependency(DependencyAI, err, latency)
+		return nil, err
 	}
 
 	var out AIDetectResponse
 	if err := json.Unmarshal(data, &out); err != nil {
+		RecordDependency(DependencyAI, err, latency)
 		return nil, err
 	}
+	RecordDependency(DependencyAI, nil, latency)
 	return &out, nil
 }