Enable Prometheus metrics

[cbcoutinho]

I would like to simplify metrics collection for Jellyfin using this Helm chart, as Jellyfin currently supports exposing Prometheus metrics, although this functionality is currently disabled by default in the upstream image.

This is how I'm currently working around the limitation in the helm chart, based on #27; however, I'm open to improvements.

# values.yaml
  image:
    command:
      - bash
      - '-c'
      - >-
        sed 's,<EnableMetrics>false</EnableMetrics>,<EnableMetrics>true</EnableMetrics>,' -i /config/config/system.xml &&
        /jellyfin/jellyfin

As well as creating a ServiceMonitor:

apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: jellyfin-svc-monitor
  namespace: jellyfin
  labels:
    release: observability
spec:
  namespaceSelector:
    matchNames:
      - jellyfin
  selector:
    matchLabels:
      app.kubernetes.io/name: jellyfin
  endpoints:
    - port: http
      path: /metrics
      interval: 15s

[Supporterino]

Hi @cbcoutinho,

I took your issue as a general idea and modified it to be modular inside the helm chart until the upstream docker container provides a better way to enable metrics. Check #39 for status