Thanks. I was looking at Elixir 1.4 though :(

On Thursday, July 13, 2017 at 10:43:40 AM UTC+2, José Valim wrote:
>
> Please see the "Custom formatting" section in the Logger docs: 
> https://hexdocs.pm/logger/master/Logger.html
>
>
>
> *José Valim*
> www.plataformatec.com.br
> Skype: jv.ptec
> Founder and Director of R&D
>
> On Thu, Jul 13, 2017 at 10:27 AM, Stephan Epping <[email protected] 
> <javascript:>> wrote:
>
>> *Use case*
>>
>> I need to convert the log format that is used for `:console` to print in 
>> json format. (Because we use a docker syslog backend that forwards `stdout` 
>> to logstash). 
>>
>> *Preferred Solution*
>>
>> Ideally, I would give the `:console` backend a custom formatter via 
>> config. The custom formatter than just converts the metadata and message to 
>> a json string, which is printed by the default `console` backend. But right 
>> now the backend relies on `Logger.Formatter` exclusively. 
>>
>> *Alternative*
>>
>> Add a custom backend that in fact intercepts the log message and converts 
>> it to json and then forwards it to the `:console` backend. Drawback: one 
>> need to somehow start and wrap the `console` backend. 
>>
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