tracing

type Config struct {
	Log *log.Logger
	Env []string
}

type Constructor func(config Config) (Tracing, error)

type Noop struct{}

type Registry struct {
	Constructors map[string]Constructor
}

type Tracing interface {
	WrapRoundTrip(rt http.RoundTripper) http.RoundTripper
	AttachTag(ctx context.Context, key string, value interface{})
	DynamicFields() []log.DynamicFields
	CreateRootMux() (*mux.Router, http.Handler)
}