Access logs of service mesh is practically important in ops work. Especially, Response Flags in each log help improve fault diagnosis efficiency by providing additional details of request. But the simple and brief definition of each field in Envoy community makes it hard to refer to it to effectively find the real problem when running into logs containing “DC, UF, UH” like flags in practice.

In this talk, Chaomeng will introduce the detailed access log use case of service mesh practice in large scale EV production environment. He will reproduce 10+ different Response Flags cases of customer’s practice, analyze what each flags indicates and when such logs generated, and demonstrate how to perform fault diagnosis and problem demarcation based on the Flags, and how to solve the problem of each case.