JSON interpretation issue with promtail

Hello,

I’m using flog to generate this kind of events:
“{“host”:“138.130.28.48”, “user-identifier”:”-", “datetime”:“25/Apr/2022:16:32:50 +0000”, “method”: “DELETE”, “request”: “/expedite”, “protocol”:“HTTP/1.0”, “status”:403, “bytes”:17719, “referer”: "https://www.dynamicproactive.name/models/relationships/expedite/vertical"}"
"{“host”:“236.116.30.89”, “user-identifier”:“kihn7123”, “datetime”:“25/Apr/2022:16:32:50 +0000”, “method”: “POST”, “request”: “/synergize/revolutionize/incentivize”, “protocol”:“HTTP/1.0”, “status”:301, “bytes”:3488, “referer”: “http://www.futurecross-media.com/infrastructures/applications”}
"
I’m using grafana loki with promtail to index events with this config:

`clients:

  • url: http://loki:3100/loki/api/v1/push
    scrape_configs:

  • job_name: flog
    static_configs:

    • targets:
      • localhost
        labels:
        job: flogs
        check: test4
        path: /tmp/log/*.log

    pipeline_stages:

    • json:
      expressions:
      datetime: datetime
      method: method
      host: host
      status: status
      bytes: bytes
      referer: referer
      `

The problem is that no field selected in the configuration is parsed.

Do you see any mistake in the configuration?

Thanks