chore(deps): update docker.io/library/node docker tag to v23.11.0

Reviewed-on: #32

.gitea/workflows/generate-readme.yaml

@@ -5,6 +5,8 @@ on:
     paths: [ "README.md", "values.yaml" ]
     types: [ "opened", "reopened", "synchronize" ]
   push:
+    branches:
+    - '**'
     paths: [ "README.md", "values.yaml" ]
     tags-ignore:
     - '**'
@@ -13,7 +15,7 @@ on:
 jobs:
   generate-parameters:
     container:
-      image: docker.io/library/node:22.13.0-alpine
+      image: docker.io/library/node:23.11.0-alpine
     runs-on:
     - ubuntu-latest
     steps:

.gitea/workflows/helm.yaml

@@ -4,6 +4,8 @@ on:
   pull_request:
     types: [ "opened", "reopened", "synchronize" ]
   push:
+    branches:
+    - '**'
     tags-ignore:
     - '**'
   workflow_dispatch: {}
@@ -11,7 +13,7 @@ on:
 jobs:
   helm-lint:
     container:
-      image: docker.io/volkerraschek/helm:3.16.4
+      image: docker.io/volkerraschek/helm:3.17.1
     runs-on:
     - ubuntu-latest
     steps:
@@ -26,7 +28,7 @@ jobs:
 
   helm-unittest:
     container:
-      image: docker.io/volkerraschek/helm:3.16.4
+      image: docker.io/volkerraschek/helm:3.17.1
     runs-on:
     - ubuntu-latest
     steps:

.gitea/workflows/markdown-linters.yaml

@@ -5,6 +5,8 @@ on:
     paths: [ "**/*.md" ]
     types: [ "opened", "reopened", "synchronize" ]
   push:
+    branches:
+    - '**'
     paths: [ "**/*.md" ]
     tags-ignore:
     - '**'
@@ -13,7 +15,7 @@ on:
 jobs:
   markdown-link-checker:
     container:
-      image: docker.io/library/node:22.13.0-alpine
+      image: docker.io/library/node:23.11.0-alpine
     runs-on:
     - ubuntu-latest
     steps:
@@ -29,7 +31,7 @@ jobs:
 
   markdown-lint:
     container:
-      image: docker.io/library/node:22.13.0-alpine
+      image: docker.io/library/node:23.11.0-alpine
     runs-on:
     - ubuntu-latest
     steps:

.gitea/workflows/release.yaml

@@ -8,7 +8,7 @@ on:
 jobs:
   publish-chart:
     container:
-      image: docker.io/volkerraschek/helm:3.16.4
+      image: docker.io/volkerraschek/helm:3.17.1
     runs-on: ubuntu-latest
     steps:
       - name: Install tooling

Chart.yaml

@@ -4,7 +4,7 @@ description: Prometheus metric exporter for PostgreSQL
 type: application
 kubeVersion: ">=1.20.0"
 version: "0.1.0"
-appVersion: "0.16.0"
+appVersion: "0.17.1"
 
 # icon: https://annotations.example.com/icon.png
 

Makefile

@@ -4,13 +4,13 @@ CONTAINER_RUNTIME?=$(shell which podman)
 # HELM_IMAGE
 HELM_IMAGE_REGISTRY_HOST?=docker.io
 HELM_IMAGE_REPOSITORY?=volkerraschek/helm
-HELM_IMAGE_VERSION?=3.16.1 # renovate: datasource=docker registryUrl=https://docker.io depName=volkerraschek/helm
+HELM_IMAGE_VERSION?=3.17.1 # renovate: datasource=docker registryUrl=https://docker.io depName=volkerraschek/helm
 HELM_IMAGE_FULLY_QUALIFIED=${HELM_IMAGE_REGISTRY_HOST}/${HELM_IMAGE_REPOSITORY}:${HELM_IMAGE_VERSION}
 
 # NODE_IMAGE
 NODE_IMAGE_REGISTRY_HOST?=docker.io
 NODE_IMAGE_REPOSITORY?=library/node
-NODE_IMAGE_VERSION?=22.9.0-alpine # renovate: datasource=docker registryUrl=https://docker.io depName=library/node
+NODE_IMAGE_VERSION?=22.14.0-alpine # renovate: datasource=docker registryUrl=https://docker.io depName=library/node
 NODE_IMAGE_FULLY_QUALIFIED=${NODE_IMAGE_REGISTRY_HOST}/${NODE_IMAGE_REPOSITORY}:${NODE_IMAGE_VERSION}
 
 # MISSING DOT

README.md

@@ -20,7 +20,7 @@ helm chart is tested for deployment scenarios with **ArgoCD**.
 ## Helm: configuration and installation
 
 1. A helm chart repository must be configured, to pull the helm charts from.
-2. All available parameters are [here](#parameters) in detail document. The parameters can be defined via the helm
+2. All available parameters are [here](#parameters) in detail documented. The parameters can be defined via the helm
    `--set` flag or directly as part of a `values.yaml` file. The following example defines the `prometheus-exporter`
    repository and use the `--set` flag for a basic deployment.
 
@@ -46,7 +46,7 @@ version of the chart must be in sync with the `values.yaml`. Newer *minor* versi
 versions can break something!
 
 ```bash
-CHART_VERSION=0.1.0
+CHART_VERSION=0.4.2
 helm show values prometheus-exporters/prometheus-postgres-exporter --version "${CHART_VERSION}" > values.yaml
 ```
 
@@ -71,7 +71,7 @@ cannot use the available CPU time to perform computing operations.
 
 The application must be informed that despite several CPUs only a part (limit) of the available computing time is
 available. As this is a Golang application, this can be implemented using `GOMAXPROCS`. The following example is one way
-of defining `GOMAXPROCS` automatically based on the defined CPU limit like `100m`. Please keep in mind, that the CFS
+of defining `GOMAXPROCS` automatically based on the defined CPU limit like `1000m`. Please keep in mind, that the CFS
 rate of `100ms` - default on each kubernetes node, is also very important to avoid CPU throttling.
 
 Further information about this topic can be found [here](https://kanishk.io/posts/cpu-throttling-in-containerized-go-apps/).
@@ -79,6 +79,8 @@ Further information about this topic can be found [here](https://kanishk.io/post
 > [!NOTE]
 > The environment variable `GOMAXPROCS` is set automatically, when a CPU limit is defined. An explicit configuration is
 > not anymore required.
+>
+> Please take care the a CPU limit < `1000m` can also lead to CPU throttling. Please read the linked documentation carefully.
 
 ```bash
 helm install prometheus-postgres-exporter prometheus-exporters/prometheus-postgres-exporter \
@@ -89,7 +91,7 @@ helm install prometheus-postgres-exporter prometheus-exporters/prometheus-postgr
   --set 'prometheus.metrics.serviceMonitor.enabled=true' \
   --set 'deployment.postgresExporter.env.name=GOMAXPROCS' \
   --set 'deployment.postgresExporter.env.valueFrom.resourceFieldRef.resource=limits.cpu' \
-  --set 'deployment.postgresExporter.resources.limits.cpu=100m'
+  --set 'deployment.postgresExporter.resources.limits.cpu=1000m'
 ```
 
 #### TLS authentication and encryption
@@ -187,6 +189,75 @@ deployment:
             - postgres
 ```
 
+### Network policies
+
+Network policies can only take effect, when the used CNI plugin support network policies. The chart supports no custom
+network policy implementation of CNI plugins. It's support only the official API resource of `networking.k8s.io/v1`.
+
+The object networkPolicies can contains multiple networkPolicy definitions. There is currently only one example
+predefined - it's named `default`. Further networkPolicy rules can easy be added by defining additional objects. For example:
+
+> [!NOTE]
+> The structure of each custom network policy must be equal like that of default. For this reason don't forget to define
+> `annotations`, `labels` and the other properties as well.
+
+```yaml
+networkPolicies:
+  enabled: false
+  default: {}
+  my-custom-network-policy: {}
+```
+
+The example below is an excerpt of the `values.yaml` file. The network policy `default` contains ingress rules to allow
+incoming traffic from Prometheus. Additionally two egress rules are defined, to allow the application outgoing access to
+the internal running DNS server `core-dns` and the external running postgres database listen on `10.14.243.12`.
+
+> [!IMPORTANT]
+> Please keep in mind, that the namespace and pod selector labels can be different from environment to environment. For
+> this reason, there is are not default network policy rules defined.
+
+```yaml
+networkPolicies:
+  enabled: true
+  default:
+    enabled: true
+    annotations: {}
+    labels: {}
+    policyTypes:
+    - Egress
+    - Ingress
+    egress:
+    - to:
+      - ipBlock:
+          cidr: 10.14.243.12/32
+      ports:
+      - port: 5432
+        protocol: TCP
+    - to:
+      - namespaceSelector:
+          matchLabels:
+            kubernetes.io/metadata.name: kube-system
+        podSelector:
+          matchLabels:
+           k8s-app: kube-dns
+      ports:
+      - port: 53
+        protocol: TCP
+      - port: 53
+        protocol: UDP
+    ingress:
+    - from:
+      - namespaceSelector:
+          matchLabels:
+            kubernetes.io/metadata.name: monitoring
+        podSelector:
+          matchLabels:
+            app.kubernetes.io/name: prometheus
+      ports:
+      - port: http
+        protocol: TCP
+```
+
 ## Parameters
 
 ### Global
@@ -248,7 +319,7 @@ deployment:
 | `deployment.replicas`                              | Number of replicas for the postgres-exporter deployment.                                                   | `1`                                     |
 | `deployment.restartPolicy`                         | Restart policy of the postgres-exporter deployment.                                                        | `""`                                    |
 | `deployment.securityContext`                       | Security context of the postgres-exporter deployment.                                                      | `{}`                                    |
-| `deployment.strategy.type`                         | Strategy type - `Recreate` or `Rollingupdate`.                                                             | `Recreate`                              |
+| `deployment.strategy.type`                         | Strategy type - `Recreate` or `RollingUpdate`.                                                             | `RollingUpdate`                         |
 | `deployment.strategy.rollingUpdate.maxSurge`       | The maximum number of pods that can be scheduled above the desired number of pods during a rolling update. | `1`                                     |
 | `deployment.strategy.rollingUpdate.maxUnavailable` | The maximum number of pods that can be unavailable during a rolling update.                                | `1`                                     |
 | `deployment.terminationGracePeriodSeconds`         | How long to wait until forcefully kill the pod.                                                            | `60`                                    |
@@ -283,11 +354,17 @@ deployment:
 | --------------------- | ---------------------- | ----- |
 | `podDisruptionBudget` | Pod disruption budget. | `{}`  |
 
-### Network
+### NetworkPolicies
 
-| Name              | Description                                                                                                        | Value |
-| ----------------- | ------------------------------------------------------------------------------------------------------------------ | ----- |
-| `networkPolicies` | Deploy network policies based on the used container network interface (CNI) implementation - like calico or weave. | `{}`  |
+| Name                                  | Description                                                                                           | Value   |
+| ------------------------------------- | ----------------------------------------------------------------------------------------------------- | ------- |
+| `networkPolicies.enabled`             | Enable network policies in general.                                                                   | `false` |
+| `networkPolicies.default.enabled`     | Enable the network policy for accessing the application by default. For example to scape the metrics. | `false` |
+| `networkPolicies.default.annotations` | Additional network policy annotations.                                                                | `{}`    |
+| `networkPolicies.default.labels`      | Additional network policy labels.                                                                     | `{}`    |
+| `networkPolicies.default.policyTypes` | List of policy types. Supported is ingress, egress or ingress and egress.                             | `[]`    |
+| `networkPolicies.default.egress`      | Concrete egress network policy implementation.                                                        | `[]`    |
+| `networkPolicies.default.ingress`     | Concrete ingress network policy implementation.                                                       | `[]`    |
 
 ### Prometheus
 

package.json

@@ -16,6 +16,6 @@
   "devDependencies": {
     "@bitnami/readme-generator-for-helm": "^2.5.0",
     "markdown-link-check": "^3.13.6",
-    "markdownlint-cli": "^0.43.0"
+    "markdownlint-cli": "^0.44.0"
   }
 }

renovate.json

@@ -1,9 +1,14 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "assignees": [ "volker.raschek" ],
+  "extends": [
+    "local>volker.raschek/renovate-config:default#master",
+    "local>volker.raschek/renovate-config:container#master",
+    "local>volker.raschek/renovate-config:actions#master",
+    "local>volker.raschek/renovate-config:npm#master",
+    "local>volker.raschek/renovate-config:regexp#master"
+  ],
   "customManagers": [
     {
-      "description": "Update container image reference",
       "fileMatch": [
         "^Chart\\.yaml$"
       ],
@@ -16,28 +21,22 @@
       "versioningTemplate": "semver"
     },
     {
-      "description": "Detect helm chart version in README",
       "fileMatch": ["^README\\.md$"],
       "matchStrings": [
-        "^CHART_VERSION=(?<currentValue>.*)$"
+        "VERSION=(?<currentValue>.*)"
       ],
-      "datasourceTemplate": "git-tags",
       "depNameTemplate": "volker.raschek/prometheus-postgres-exporter",
       "packageNameTemplate": "https://git.cryptic.systems/volker.raschek/prometheus-postgres-exporter",
+      "datasourceTemplate": "git-tags",
       "versioningTemplate": "semver"
     }
   ],
-  "labels": [ "renovate" ],
   "packageRules": [
     {
-      "addLabels": [ "renovate/automerge", "renovate/npm" ],
-      "automerge": true,
-      "matchPackageNames": [ "markdownlint-cli", "@bitnami/readme-generator-for-helm" ],
-      "matchManagers": [ "npm" ],
-      "matchUpdateTypes": [ "minor", "patch"]
-    },
-    {
-      "addLabels": [ "renovate/automerge", "renovate/container" ],
+      "addLabels": [
+        "renovate/automerge",
+        "renovate/container"
+      ],
       "automerge": true,
       "excludePackagePatterns": [
         "prometheuscommunity/postgres-exporter"
@@ -51,7 +50,10 @@
       ]
     },
     {
-      "addLabels": [ "renovate/automerge", "renovate/documentation" ],
+      "addLabels": [
+        "renovate/automerge",
+        "renovate/documentation"
+      ],
       "automerge": true,
       "matchDepNames": [
         "volker.raschek/prometheus-postgres-exporter"
@@ -62,7 +64,5 @@
         "patch"
       ]
     }
-  ],
-  "rebaseLabel": "renovate/rebase",
-  "rebaseWhen": "behind-base-branch"
+  ]
 }

templates/prometheus-postgres-exporter/_deployment.tpl

@@ -14,7 +14,7 @@
 {{- define "prometheus-postgres-exporter.deployment.env" -}}
 {{- $env := dict "env" (.Values.deployment.postgresExporter.env | default (list) ) }}
 {{- if and (hasKey .Values.deployment.postgresExporter.resources "limits") (hasKey .Values.deployment.postgresExporter.resources.limits "cpu") }}
-{{- $env = merge $env (dict "env" (list (dict "name" "GOMAXPROCS" "valueFrom" (dict "resourceFieldRef" (dict "resource" "limits.cpu"))))) }}
+{{- $env = merge $env (dict "env" (list (dict "name" "GOMAXPROCS" "valueFrom" (dict "resourceFieldRef" (dict "divisor" "1" "resource" "limits.cpu"))))) }}
 {{- end }}
 {{ toYaml $env }}
 {{- end -}}

templates/prometheus-postgres-exporter/_networkPolicies.tpl

@@ -0,0 +1,19 @@
+{{/* vim: set filetype=mustache: */}}
+
+{{/* annotations */}}
+
+{{- define "prometheus-postgres-exporter.networkPolicies.annotations" -}}
+{{ include "prometheus-postgres-exporter.annotations" .context }}
+{{- if .networkPolicy.annotations }}
+{{ toYaml .networkPolicy.annotations }}
+{{- end }}
+{{- end }}
+
+{{/* labels */}}
+
+{{- define "prometheus-postgres-exporter.networkPolicies.labels" -}}
+{{ include "prometheus-postgres-exporter.labels" .context }}
+{{- if .networkPolicy.labels }}
+{{ toYaml .networkPolicy.labels }}
+{{- end }}
+{{- end }}

templates/prometheus-postgres-exporter/deployment.yaml

@@ -126,3 +126,7 @@ spec:
       volumes:
       {{- toYaml $volumes.volumes | nindent 6 }}
       {{- end }}
+  {{- with .Values.deployment.strategy }}
+  strategy:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}

templates/prometheus-postgres-exporter/networkPolicies.yaml

@@ -0,0 +1,36 @@
+{{- if .Values.networkPolicies.enabled }}
+{{- range $key, $value := .Values.networkPolicies -}}
+{{- if and (not (eq $key "enabled")) $value.enabled }}
+---
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  {{- with (include "prometheus-postgres-exporter.networkPolicies.annotations" (dict "networkPolicy" $value "context" $) | fromYaml) }}
+  annotations:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  {{- with (include "prometheus-postgres-exporter.networkPolicies.labels" (dict "networkPolicy" $value "context" $) | fromYaml) }}
+  labels:
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+  name: {{ printf "%s-%s" (include "prometheus-postgres-exporter.fullname" $ ) $key }}
+  namespace: {{ $.Release.Namespace }}
+spec:
+  podSelector:
+    matchLabels:
+      {{- include "prometheus-postgres-exporter.pod.selectorLabels" $ | nindent 6 }}
+  {{- with $value.policyTypes }}
+  policyTypes:
+  {{- toYaml . | nindent 2 }}
+  {{- end }}
+  {{- with $value.egress }}
+  egress:
+  {{- toYaml . | nindent 2 }}
+  {{- end }}
+  {{- with $value.ingress }}
+  ingress:
+  {{- toYaml . | nindent 2 }}
+  {{- end }}
+{{- end }}
+{{- end }}
+{{- end }}

unittests/deployment/deployment.yaml

@@ -95,6 +95,13 @@ tests:
       path: spec.template.spec.tolerations
   - notExists:
       path: spec.template.spec.topologySpreadConstraints
+  - equal:
+      path: spec.strategy
+      value:
+        type: "RollingUpdate"
+        rollingUpdate:
+          maxSurge: 1
+          maxUnavailable: 1
 
 - it: Test custom replicas
   set:
@@ -233,6 +240,7 @@ tests:
       - name: GOMAXPROCS
         valueFrom:
           resourceFieldRef:
+            divisor: "1"
             resource: limits.cpu
   - equal:
       path: spec.template.spec.containers[0].resources

unittests/networkPolicies/default.yaml

@@ -0,0 +1,118 @@
+chart:
+  appVersion: 0.1.0
+  version: 0.1.0
+suite: NetworkPolicies template (basic)
+release:
+  name: prometheus-postgres-exporter-unittest
+  namespace: testing
+templates:
+- templates/prometheus-postgres-exporter/networkPolicies.yaml
+tests:
+- it: Skip networkPolicies in general disabled.
+  set:
+    networkPolicies.enabled: false
+  asserts:
+  - hasDocuments:
+      count: 0
+
+- it: Skip networkPolicy 'default' when disabled.
+  set:
+    networkPolicies.enabled: true
+    networkPolicies.default.enabled: false
+  asserts:
+  - hasDocuments:
+      count: 0
+
+- it: Loop over networkPolicies
+  set:
+    networkPolicies.enabled: true
+    networkPolicies.default.enabled: false
+    networkPolicies.nginx.enabled: true
+    networkPolicies.prometheus.enabled: true
+  asserts:
+  - hasDocuments:
+      count: 2
+
+- it: Template networkPolicy 'default' without policyTypes, egress and ingress configuration
+  set:
+    networkPolicies.enabled: true
+    networkPolicies.default.enabled: true
+  asserts:
+  - hasDocuments:
+      count: 1
+  - containsDocument:
+      apiVersion: networking.k8s.io/v1
+      kind: NetworkPolicy
+      name: prometheus-postgres-exporter-unittest-default
+      namespace: testing
+  - notExists:
+      path: metadata.annotations
+  - equal:
+      path: metadata.labels
+      value:
+        app.kubernetes.io/instance: prometheus-postgres-exporter-unittest
+        app.kubernetes.io/managed-by: Helm
+        app.kubernetes.io/name: prometheus-postgres-exporter
+        app.kubernetes.io/version: 0.1.0
+        helm.sh/chart: prometheus-postgres-exporter-0.1.0
+  - equal:
+      path: spec.podSelector.matchLabels
+      value:
+        app.kubernetes.io/instance: prometheus-postgres-exporter-unittest
+        app.kubernetes.io/name: prometheus-postgres-exporter
+  - notExists:
+      path: spec.policyTypes
+  - notExists:
+      path: spec.egress
+  - notExists:
+      path: spec.ingress
+
+- it: Template networkPolicy 'default' with policyTypes, egress and ingress configuration
+  set:
+    networkPolicies.enabled: true
+    networkPolicies.default.enabled: true
+    networkPolicies.default.policyTypes:
+    - Egress
+    - Ingress
+    networkPolicies.default.ingress:
+    - from:
+      - namespaceSelector:
+          matchLabels:
+            kubernetes.io/metadata.name: khv-production
+        podSelector:
+          matchLabels:
+            app.kubernetes.io/name: prometheus
+    networkPolicies.default.egress:
+    - to:
+      - namespaceSelector:
+          matchLabels:
+            kubernetes.io/metadata.name: database
+        podSelector:
+          matchLabels:
+            app.kubernetes.io/name: oracle
+  asserts:
+  - equal:
+      path: spec.policyTypes
+      value:
+      - Egress
+      - Ingress
+  - equal:
+      path: spec.egress
+      value:
+      - to:
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: database
+          podSelector:
+            matchLabels:
+              app.kubernetes.io/name: oracle
+  - equal:
+      path: spec.ingress
+      value:
+      - from:
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: khv-production
+          podSelector:
+            matchLabels:
+              app.kubernetes.io/name: prometheus

values.yaml

@@ -224,11 +224,11 @@ deployment:
   securityContext: {}
     # fsGroup: 2000
 
-  ## @param deployment.strategy.type Strategy type - `Recreate` or `Rollingupdate`.
+  ## @param deployment.strategy.type Strategy type - `Recreate` or `RollingUpdate`.
   ## @param deployment.strategy.rollingUpdate.maxSurge The maximum number of pods that can be scheduled above the desired number of pods during a rolling update.
   ## @param deployment.strategy.rollingUpdate.maxUnavailable The maximum number of pods that can be unavailable during a rolling update.
   strategy:
-    type: "Recreate"
+    type: "RollingUpdate"
     rollingUpdate:
       maxSurge: 1
       maxUnavailable: 1
@@ -266,7 +266,7 @@ grafana:
   enabled: false
 
   ## @param grafana.dashboardDiscoveryLabels Labels that Grafana uses to discover resources. The labels may vary depending on the Grafana deployment.
-  ## @skip grafana.dashboardDiscoveryLabels
+  ## @skip grafana.dashboardDiscoveryLabels Skip individual configuration.
   dashboardDiscoveryLabels:
     grafana_dashboard: "1"
 
@@ -311,9 +311,77 @@ podDisruptionBudget: {}
 #  maxUnavailable: 1
 #  minAvailable: 1
 
-## @section Network
-## @param networkPolicies Deploy network policies based on the used container network interface (CNI) implementation - like calico or weave.
-networkPolicies: {}
+## @section NetworkPolicies
+## @param networkPolicies.enabled Enable network policies in general.
+networkPolicies:
+  enabled: false
+
+  ## @param networkPolicies.default.enabled Enable the network policy for accessing the application by default. For example to scape the metrics.
+  ## @param networkPolicies.default.annotations Additional network policy annotations.
+  ## @param networkPolicies.default.labels Additional network policy labels.
+  ## @param networkPolicies.default.policyTypes List of policy types. Supported is ingress, egress or ingress and egress.
+  ## @param networkPolicies.default.egress Concrete egress network policy implementation.
+  ## @skip networkPolicies.default.egress Skip individual egress configuration.
+  ## @param networkPolicies.default.ingress Concrete ingress network policy implementation.
+  ## @skip networkPolicies.default.ingress Skip individual ingress configuration.
+  default:
+    enabled: false
+    annotations: {}
+    labels: {}
+    policyTypes: []
+    # - Egress
+    # - Ingress
+    egress: []
+    # Allow outgoing traffic to database host
+    #
+    # - to:
+    #   - ipBlock:
+    #       cidr: 192.168.179.1/32
+    #   ports:
+    #   - port: 5432
+    #     protocol: TCP
+
+    # Allow outgoing DNS traffic to the internal running DNS-Server. For example core-dns.
+    #
+    # - to:
+    #   - namespaceSelector:
+    #       matchLabels:
+    #         kubernetes.io/metadata.name: kube-system
+    #     podSelector:
+    #       matchLabels:
+    #        k8s-app: kube-dns
+    #   ports:
+    #   - port: 53
+    #     protocol: TCP
+    #   - port: 53
+    #     protocol: UDP
+
+    ingress: []
+    # Allow incoming HTTP traffic from prometheus.
+    #
+    # - from:
+    #   - namespaceSelector:
+    #       matchLabels:
+    #         kubernetes.io/metadata.name: monitoring
+    #     podSelector:
+    #       matchLabels:
+    #         app.kubernetes.io/name: prometheus
+    #   ports:
+    #   - port: http
+    #     protocol: TCP
+
+    # Allow incoming HTTP traffic from ingress-nginx.
+    #
+    # - from:
+    #   - namespaceSelector:
+    #       matchLabels:
+    #         kubernetes.io/metadata.name: ingress-nginx
+    #     podSelector:
+    #       matchLabels:
+    #         app.kubernetes.io/name: ingress-nginx
+    #   ports:
+    #   - port: http
+    #     protocol: TCP
 
 ## @section Prometheus
 prometheus: