add trace feature

README.md

@@ -25,13 +25,16 @@ flowchart TD
     GW[Gateway<br/>Auth 鉴权<br/>Rate Limit 限流]
     FB[Fluent Bit]
 
-    SDK -->|logs / Prometheus remote_write metrics + token| GW
-    GW -->|logs / metrics| FB
+    SDK -->|OTLP logs / Prometheus remote_write metrics / OTLP trace + token| GW
+    GW -->|logs / metrics / trace| FB
+
+    BK[Backend] -->|trace| FB
 
     FB -->|logs| VL[VictoriaLogs cluster]
-
     FB -->|metrics remote_write| VM[VictoriaMetrics]
-    VM -->|query| GF[Grafana]
+    FB -->|trace| VT[VictoriaTraces]
 
+    VM -->|query| GF[Grafana]
     VL -->|query| GF
+    VT -->|jaeger query| GF
 ```