Labels not correctly stringified in request

[wyl1232792]

It's wierd. I found stream label in request body is "[object Object]".

{"streams":[{"stream":"[object Object]","values":[["1634641025327000000","{\"level\":\"info\",\"message\":\"haha\"}"]]}]}

My code:

new LokiTransport({
            host: 'http://192.168.11.204:3100',
            format: format.combine(
                format.json(),
            ),
            batching: false,
            labels: {
                biz: 'test',
            },
            json: true
        })

And it works when I remove the code below.

winston-loki/index.js

Line 73 in 0eb49ec

lokiLabels = JSON.parse(JSON.stringify(lokiLabels, (key, value) => value ? value.toString() : value))

[JaniAnttonen]

Related to #80. Downgrading helps, will draft a new release soonish :)