Service not honoring --log.format flag

[fede843]

Describe the bug
Service not honoring --log.format flag

To reproduce
Steps to reproduce the behavior:
Using docker compose:

version: '3.9'
services:
  nginx-exporter:
    image: nginx/nginx-prometheus-exporter:edge
#    image: nginx/nginx-prometheus-exporter:latest
    container_name: nginx-exporter
    hostname: nginx-exporter
    restart: always
    labels:
      - prometheus_job=nginx
      - prometheus_metrics_port=9113
#      - prometheus_metrics_path=/metrics
    command:
      - '--nginx.scrape-uri=http://nginx:81/nginx_status'
      - '--log.level=info'
      - '--log.format=json'
    networks:
      - mainnet
#    ports:
#      - 9113:9113

Logs are showing as:

level=info ts=2023-10-17T12:53:40.498Z caller=exporter.go:118 msg="Starting nginx-prometheus-exporter" version="(version=edge, branch=main, revision=b342fe37626c8c44df0543f1b619aec8272efb10)"
level=info ts=2023-10-17T12:53:40.498Z caller=exporter.go:119 msg="Build context" build_context="(go=go1.19.13, platform=linux/amd64, user=goreleaser, date=2023-10-12T10:10:21Z, tags=unknown)"
level=info ts=2023-10-17T12:53:40.498Z caller=tls_config.go:274 msg="Listening on" address=[::]:9113
level=info ts=2023-10-17T12:53:40.498Z caller=tls_config.go:277 msg="TLS is disabled." http2=false address=[::]:9113

Expected behavior

Logs should be json, and not logfmt.

Your environment

• Version: docker edge revision=b342fe37626c8c44df0543f1b619aec8272efb10
• Docker 24.0.5-ce
• NGINX 1.25.2 (docker)

[lucacome]

Thanks @fede843 for catching this! I've opened a PR to fix it.

[fede843]

Thank you!