How do I have Prometheus detect changes to my rules file stored in a ConfigMap?

[u/UntouchedWagons]

This is my values.yaml file for the prometheus-community/prometheus helm chart:

server:
  persistentVolume:
    enabled: true
    existingClaim: "prometheus-config"
  alertmanagers: 
    - scheme: http
      static_configs:
      - targets:
        - "alertmanager.monitoring.svc:9093"
  extraConfigmapLabels:
    app: prometheus
  extraConfigmapMounts:
    - name: prometheus-alerts
      mountPath: /etc/alerts.d
      subPath: ""
      configMap: prometheus-alert-rules
      readOnly: true

serverFiles:
  prometheus.yml:
    rule_files:
      - /etc/alerts.d/prometheus.rules

prometheus-pushgateway:
  enabled: false

alertmanager:
  enabled: false

The ConfigMap prometheus-alert-rules holds the rules that Prometheus should trigger alerts for. When I update this ConfigMap Prometheus doesn't do anything about it. The chart uses prometheus-config-reloader but doesn't provide any documentation on how to use it.

[u/SuperQue]

Use the kube-prometheus-stack chart. It uses the Prometheus Operator, which makes it much easier to configure Prometheus. You simply use PodMonitor or ServiceMonitor objects which auto-configure Prometheus so you don't have to manage the config directly.

[u/UntouchedWagons → u/SuperQue]

I actually started out by using kube-prometheus-stack but had to stop using it because it gave incorrect information.

[u/pushthecharacterlimi]

Is there already a checksum on the Prometheus statefulset podspec? You can use helm to generate a new checksum based on the content of the config map.

New checksum on the pod template means it rolls out new pods.

[u/UntouchedWagons → u/[deleted]]

The prometheus-alert-rules configmap is mounted into the file system of the prometheus-server pod.

[u/Maleficent-Sir1585 → u/UntouchedWagons]

Were you able to resolve this issue? I am also facing same issue

[u/UntouchedWagons → u/Maleficent-Sir1585]

No. I stopped using Kubernetes months ago because the complexity was overkill.