OpenTelemetry 微服务链路追踪
github.com/go-kratos/kratos/v2@v2.1.2/middleware/tracing/tracing.go:11
Tracing：遵循 OpenTelemetry 规范定义，以实现微服务链路追踪；
kratos/main.go at main · go-kratos/kratos https://github.com/go-kratos/kratos/blob/main/examples/traces/app/user/main.go
OpenTelemetry 简析 - 知乎 https://zhuanlan.zhihu.com/p/365398397
收集器 | OpenTelemetry 中文文档 https://opentelemetry.opendocs.io/docs/collector/
