Imports
- github.com/containous/traefik/middlewares/tracing/zipkin
- github.com/opentracing/opentracing-go
- github.com/containous/traefik/middlewares/tracing/jaeger
- github.com/opentracing/opentracing-go/ext
- github.com/containous/traefik/log
- github.com/containous/traefik/middlewares/tracing/datadog
- github.com/urfave/negroni