argocd-image-updater: ServiceMonitor expects port metrics but Service exposes only https

[r0bj]

Describe the bug

ServiceMonitor expects port metrics but Service exposes only https → Prometheus cannot scrape metrics (v1.0.1)

Version

Chart: argocd-image-updater-1.0.1
App version: v1.0.1

Summary

When enabling metrics and ServiceMonitor via Helm values:

metrics:
  enabled: true
  serviceMonitor:
    enabled: true

the chart creates a ServiceMonitor that assumes the Service contains a port named metrics.
However, the Service generated by the same chart exposes only a port named https.

This mismatch causes the Prometheus operator to fail to attach a target, so metrics are not scraped at all.

---

Actual behavior

Generated ServiceMonitor:

spec:
  endpoints:
    - interval: 30s
      path: /metrics
      port: metrics   # <--- this port name does NOT exist in the Service

Generated Service:

spec:
  ports:
    - name: https      # <--- only this port exists
      port: 8443
      targetPort: metrics

Because the ServiceMonitor references a non-existent port (metrics), Prometheus operator logs a port-not-found error and does not create a scrape target.

This results in completely broken metrics for argocd-image-updater.

---

Impact

• No metrics from argocd-image-updater are scraped.
• Any dashboards/alerts depending on these metrics do not work.
• Monitoring integrations are effectively broken.

---

Proposed fix

Option A — fix ServiceMonitor (simplest)

Change port: metrics → port: https.

Option B — fix Service

ports:
  - name: metrics
    port: 8443
    targetPort: metrics

Option C — allow configuring ServiceMonitor port name

metrics:
  serviceMonitor:
    portName: https

Related helm chart

argocd-image-updater

Helm chart version

1.0.1

To Reproduce

Steps to reproduce

1. Install chart argocd-image-updater-1.0.1 with:

   metrics:
     enabled: true
     serviceMonitor:
       enabled: true

2. Apply the manifests.

3. Inspect:

   • ServiceMonitor → spec.endpoints[0].port = metrics
   • Service → only port name https

4. Check Prometheus targets → argocd-image-updater metrics are missing.

5. Prometheus operator logs port-not-found warning.

Expected behavior

The ServiceMonitor should match the actual Service port name, or the Service should expose a port named metrics.

Either the Service should define:

ports:
  - name: metrics
    port: 8443
    targetPort: metrics

OR

the ServiceMonitor should use port: https.

Screenshots

No response

Additional context

No response