Duplicate ports warning

### What happened?

## Description

I recently updated prometheus-operator and saw the following line in the logs of the operator:

```
level=warn ts=2024-02-05T06:00:35.226955216Z caller=klog.go:106 component=k8s_client_runtime func=Warning msg="spec.template.spec.containers[1].ports[0]: duplicate port definition with spec.template.spec.initContainers[0].ports[0]"
```

I wasn't sure which pod actually declared duplicate ports, so after a short search I noticed that all prometheus pods now have both an initContainer (init-config-reloader) as well as a regular container (config-reloader) running on port 8080. Since I'm not the one who declared those ports/containers, I'm not sure whether I should do something about this warning.

## Steps to Reproduce

- Deploy latest prometheus-operator
- Deploy minimal `Prometheus` resource
- Watch logs of operator

## Expected Result

No warning should appear or at least the warning should tell me what to do.

## Actual Result

Warning confuses me & I want to go home


### Prometheus Operator Version

```shell
v0.71.2
```


### Kubernetes Version

```yaml
v1.28.6
```


### Kubernetes Cluster Type

kubeadm

### How did you deploy Prometheus-Operator?

yaml manifests

### Manifests

```yaml
apiVersion: monitoring.coreos.com/v1
kind: Prometheus
metadata:
  labels:
    app.kubernetes.io/component: prometheus
    app.kubernetes.io/instance: autoscaling
    app.kubernetes.io/name: prometheus
    app.kubernetes.io/part-of: monitoring
  name: autoscaling
  namespace: prometheus
spec:
  additionalAlertManagerConfigs:
    key: prometheus-configuration
    name: alertmanager-configuration
    optional: false
  enableFeatures:
    - auto-gomaxprocs
  enableAdminAPI: true
  enforcedSampleLimit: 100
  evaluationInterval: 30s
  image: harbor.infra.run/dockerhub/prom/prometheus:v2.49.1
  imagePullSecrets:
    - name: harbor-infra-run-pull-secret
  nodeSelector:
    kubernetes.io/os: linux
  podMetadata:
    labels:
      app.kubernetes.io/component: prometheus
      app.kubernetes.io/instance: autoscaling
      app.kubernetes.io/name: prometheus
      app.kubernetes.io/part-of: monitoring
  podMonitorNamespaceSelector:
    matchLabels:
      autoscaling.prometheus.kube.infra.run/discovery: enabled
  podMonitorSelector:
    matchLabels:
      autoscaling.prometheus.kube.infra.run/discovery: enabled
  replicas: 2
  replicaExternalLabelName: prometheus_replica
  shards: 1
  retention: '6h'
  ruleNamespaceSelector:
    matchLabels:
      autoscaling.prometheus.kube.infra.run/discovery: enabled
  ruleSelector:
    matchLabels:
      autoscaling.prometheus.kube.infra.run/discovery: enabled
  scrapeInterval: 15s
  scrapeTimeout: 10s
  securityContext:
    fsGroup: 2000
    runAsNonRoot: true
    runAsUser: 1000
    runAsGroup: 2000
  serviceAccountName: prometheus-autoscaling
  serviceMonitorNamespaceSelector:
    matchLabels:
      autoscaling.prometheus.kube.infra.run/discovery: enabled
  serviceMonitorSelector:
    matchLabels:
      autoscaling.prometheus.kube.infra.run/discovery: enabled
  storage:
    volumeClaimTemplate:
      metadata:
        name: prometheus-autoscaling-data
        labels:
          app.kubernetes.io/component: prometheus
          app.kubernetes.io/instance: autoscaling
          app.kubernetes.io/name: prometheus
          app.kubernetes.io/part-of: monitoring
      spec:
        accessModes:
          - ReadWriteOnce
        storageClassName: csi-rbd
  thanos:
    image: harbor.infra.run/quay/thanos/thanos:v0.34.0
  web:
    pageTitle: Prometheus Autoscaling
```


### prometheus-operator log output

```shell
level=info ts=2024-02-05T06:00:34.810681Z caller=main.go:181 msg="Starting Prometheus Operator" version="(version=0.71.2, branch=refs/tags/v0.71.2, revision=af2014407bdc25c4fc2b26cd99c9655235ebdf88)"
level=info ts=2024-02-05T06:00:34.810751593Z caller=main.go:182 build_context="(go=go1.21.6, platform=linux/amd64, user=Action-Run-ID-7656327832, date=20240125-14:57:39, tags=unknown)"
level=info ts=2024-02-05T06:00:34.810767765Z caller=main.go:193 msg="namespaces filtering configuration " config="{allow_list=\"\",deny_list=\"\",prometheus_allow_list=\"\",alertmanager_allow_list=\"\",alertmanagerconfig_allow_list=\"\",thanosruler_allow_list=\"\"}"
level=info ts=2024-02-05T06:00:34.825852745Z caller=main.go:222 msg="connection established" cluster-version=v1.28.6
level=info ts=2024-02-05T06:00:34.855289664Z caller=operator.go:333 component=prometheus-controller msg="Kubernetes API capabilities" endpointslices=true
level=info ts=2024-02-05T06:00:34.874428002Z caller=operator.go:319 component=prometheusagent-controller msg="Kubernetes API capabilities" endpointslices=true
level=info ts=2024-02-05T06:00:34.893257626Z caller=server.go:298 msg="starting insecure server" address=[::]:8080
level=info ts=2024-02-05T06:00:34.992779203Z caller=operator.go:428 component=prometheusagent-controller msg="successfully synced all caches"
level=info ts=2024-02-05T06:00:34.994188604Z caller=operator.go:280 component=thanos-controller msg="successfully synced all caches"
level=info ts=2024-02-05T06:00:34.99522074Z caller=operator.go:542 component=thanos-controller key=prometheus/thanos-ruler-global msg="sync thanos-ruler"
level=info ts=2024-02-05T06:00:34.99545999Z caller=operator.go:311 component=alertmanager-controller msg="successfully synced all caches"
level=info ts=2024-02-05T06:00:34.999846973Z caller=operator.go:390 component=prometheus-controller msg="successfully synced all caches"
level=info ts=2024-02-05T06:00:35.003405968Z caller=operator.go:987 component=prometheus-controller key=prometheus/general msg="sync prometheus"
level=info ts=2024-02-05T06:00:35.164126655Z caller=operator.go:542 component=thanos-controller key=prometheus/thanos-ruler-global msg="sync thanos-ruler"
level=warn ts=2024-02-05T06:00:35.226955216Z caller=klog.go:106 component=k8s_client_runtime func=Warning msg="spec.template.spec.containers[1].ports[0]: duplicate port definition with spec.template.spec.initContainers[0].ports[0]"
level=warn ts=2024-02-05T06:00:35.309322232Z caller=klog.go:106 component=k8s_client_runtime func=Warning msg="spec.template.spec.containers[1].ports[0]: duplicate port definition with spec.template.spec.initContainers[0].ports[0]"
level=info ts=2024-02-05T06:00:35.319266257Z caller=operator.go:987 component=prometheus-controller key=prometheus/heavy msg="sync prometheus"
level=info ts=2024-02-05T06:00:35.344992244Z caller=operator.go:542 component=thanos-controller key=prometheus/thanos-ruler-global msg="sync thanos-ruler"
level=info ts=2024-02-05T06:00:35.428711029Z caller=operator.go:542 component=thanos-controller key=prometheus/thanos-ruler-global msg="sync thanos-ruler"
level=warn ts=2024-02-05T06:00:35.508559635Z caller=klog.go:106 component=k8s_client_runtime func=Warning msg="spec.template.spec.containers[1].ports[0]: duplicate port definition with spec.template.spec.initContainers[0].ports[0]"
level=info ts=2024-02-05T06:00:35.517673114Z caller=operator.go:987 component=prometheus-controller key=prometheus/autoscaling msg="sync prometheus"
level=warn ts=2024-02-05T06:00:35.677154596Z caller=klog.go:106 component=k8s_client_runtime func=Warning msg="spec.template.spec.containers[1].ports[0]: duplicate port definition with spec.template.spec.initContainers[0].ports[0]"
level=info ts=2024-02-05T06:00:35.685996793Z caller=operator.go:987 component=prometheus-controller key=prometheus/lernraum msg="sync prometheus"
level=warn ts=2024-02-05T06:00:35.862035321Z caller=klog.go:106 component=k8s_client_runtime func=Warning msg="spec.template.spec.containers[1].ports[0]: duplicate port definition with spec.template.spec.initContainers[0].ports[0]"
level=info ts=2024-02-05T06:00:35.866906713Z caller=operator.go:987 component=prometheus-controller key=prometheus/meta msg="sync prometheus"
level=warn ts=2024-02-05T06:00:36.048482343Z caller=klog.go:106 component=k8s_client_runtime func=Warning msg="spec.template.spec.containers[1].ports[0]: duplicate port definition with spec.template.spec.initContainers[0].ports[0]"
```


### Anything else?

I'm not sure whether the warning appeared in earlier versions..

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Uh oh!

Duplicate ports warning #6284

What happened?

Description

Steps to Reproduce

Expected Result

Actual Result

Prometheus Operator Version

Kubernetes Version

Kubernetes Cluster Type

How did you deploy Prometheus-Operator?

Manifests

prometheus-operator log output

Anything else?

Metadata

Assignees

Labels

Type

Projects

Milestone

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Development

Duplicate ports warning #6284

Description

What happened?

Description

Steps to Reproduce

Expected Result

Actual Result

Prometheus Operator Version

Kubernetes Version

Kubernetes Cluster Type

How did you deploy Prometheus-Operator?

Manifests

prometheus-operator log output

Anything else?

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions