[BUG] Distributed Tracing数据聚合异常 about deepflow

[taloric]

@ImJerryChan
I've checked the data of csv that I noticed there're a few issues:

1. sort of network and syscall is wrong, and some of them sorted with short duration upper and long duration lower;
   • Solution: you should update deepflow-app to latest version ,it fixed the sorting here.
2. some observation_point were lost: you should check your agent status and try to find out if request every time upload same count of span;
   • Solution: check /DeepFlow_Alert_Analysis dashboard on Grafana, confirm agent status
   • try to instrument gloabl trace id through each service;
3. DNS span is not the main issue, it seems it did send DNS request in the same thread, it's what our expected;