feedback: Metrics plugins | Tarantool

> <…>   function(req)
>         return req:render({
>             text = **|json_exporter|.export()**
>         })
>     end
> )
> 
> 
> 
> 
> 
> 
> Plugin-specific API
> Use the<…>

https://www.tarantool.io/en/doc/latest/book/monitoring/plugins/#json

`json_exporter` is not defined anywhere.