fix

mooctest-site-server/src/main/resources/log4j2.online.yaml

@@ -6,7 +6,8 @@ Configuration:
       - name: filename
         value: mooctest-site.log
       - name: pattern
-        value: "%d{yyyy-MM-dd HH:mm:ss} [%p] [%t] [%c] %m%n"
+        value: "%d{yyyy-MM-dd HH:mm:ss} [%X{X-B3-TraceId},%X{X-B3-SpanId},%X{X-B3-ParentSpanId},%X{X-Span-Export}] 
+        [%p] [%t] [%c] %m%n"
       - name: httpRequestPattern
         value: "%-d{yyyy-MM-dd HH:mm:ss} %m%n"