feat(kube-monitoring): adds prometheus blackbox-exporter (#630)

* feat(kube-monitoring): adds prometheus blackbox-exporter

The blackbox exporter can be utilised to read Probe CRs. A Probe defines
how groups of ingresses and static targets should be monitored.

Signed-off-by: Richard Tief <richard.tief@sap.com>

* chore(kube-monitoring): introduce ci test values

Signed-off-by: Richard Tief <richard.tief@sap.com>

* fix(kube-monitoring): blackbox-exporter condition

Signed-off-by: Richard Tief <richard.tief@sap.com>

* fix(kube-monitoring): carry over blackbox-exporter templates

Signed-off-by: Richard Tief <richard.tief@sap.com>

* chore(kube-monitoring): rebase onto master

Signed-off-by: Richard Tief <richard.tief@sap.com>

---------

Signed-off-by: Richard Tief <richard.tief@sap.com>

Author: richardtief

kube-monitoring/charts/Chart.lock

@@ -5,5 +5,8 @@ dependencies:
 - name: kubernetes-operations
   repository: https://cloudoperators.github.io/kubernetes-operations
   version: 1.1.5
-digest: sha256:0102e656196a4054b6afdbd43c86d58e6fabff72b5bf4d859cb2cb68fb78284f
-generated: "2025-02-21T09:26:54.342149+01:00"
+- name: prometheus-blackbox-exporter
+  repository: https://prometheus-community.github.io/helm-charts
+  version: 9.2.0
+digest: sha256:f447c32ccbdebd23cd8697a871ff24841e773bef5ff4919ca414d4ad04f6f75e
+generated: "2025-02-21T15:04:05.862105+01:00"

kube-monitoring/charts/Chart.yaml

@@ -8,7 +8,7 @@ maintainers:
 name: kube-monitoring
 sources:
   - https://github.com/cloudoperators/greenhouse-extensions
-version: 0.25.0
+version: 0.25.1
 keywords:
   - operator
   - prometheus
@@ -21,3 +21,8 @@ dependencies:
   - name: kubernetes-operations
     repository: https://cloudoperators.github.io/kubernetes-operations
     version: 1.1.5
+  - name: prometheus-blackbox-exporter
+    alias: blackboxExporter
+    repository: https://prometheus-community.github.io/helm-charts
+    version: 9.2.0
+    condition: blackboxExporter.enabled

kube-monitoring/charts/charts/prometheus-blackbox-exporter-9.2.0.tgz

@@ -0,0 +1,2 @@
+blackboxExporter:
+  enabled: true

kube-monitoring/charts/ci/test-values.yaml

@@ -23,6 +23,10 @@ The longest name that gets created adds and extra 37 characters, so truncation s
 {{- printf "%s-%s" $.Release.Name "node-exporter" | trunc 63 | trimSuffix "-" -}}
 {{- end -}}
 
+{{- define "prometheus-blackbox-exporter.fullname" -}}
+{{- printf "%s-%s" $.Release.Name "blackbox-exporter" | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+
 {{/* Generate basic labels */}}
 {{ define "kube-prometheus-stack.labels" }}
 plugindefinition: kube-monitoring
@@ -60,7 +64,7 @@ release: {{ .Release.Name }}
 {{- end }}
 
 {{/*
-Common labels
+Common node-exporter labels
 */}}
 {{- define "prometheus-node-exporter.labels" -}}
 plugindefinition: kube-monitoring
@@ -84,6 +88,31 @@ release: {{ .Release.Name }}
 {{- end }}
 {{- end }}
 
+{{/*
+Common labels
+*/}}
+{{- define "prometheus-blackbox-exporter.labels" -}}
+plugindefinition: kube-monitoring
+plugin: {{ $.Release.Name }}
+{{- if .Values.global.commonLabels }}
+{{ tpl (toYaml .Values.global.commonLabels) . }}
+{{- end }}
+helm.sh/chart: {{ include "prometheus-blackbox-exporter.chart" . }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+app.kubernetes.io/component: metrics
+app.kubernetes.io/part-of: {{ include "prometheus-blackbox-exporter.name" . }}
+{{ include "prometheus-node-exporter.selectorLabels" . }}
+{{- with .Chart.AppVersion }}
+app.kubernetes.io/version: {{ . | quote }}
+{{- end }}
+{{- with .Values.podLabels }}
+{{ toYaml . }}
+{{- end }}
+{{- if .Values.releaseLabel }}
+release: {{ .Release.Name }}
+{{- end }}
+{{- end }}
+
 {{/* Generate basic labels */}}
 {{ define "kubeMonitoring.labels" }}
 {{- $path := index . 0 -}}

kube-monitoring/charts/templates/_helper.tpl

@@ -370,3 +370,6 @@ testFramework:
     repository: cloudoperators/greenhouse-extensions-integration-test
     tag: main
   imagePullPolicy: IfNotPresent
+
+blackboxExporter:
+  enabled: false

kube-monitoring/charts/values.yaml

@@ -6,15 +6,15 @@ kind: PluginDefinition
 metadata:
   name: kube-monitoring
 spec:
-  version: 2.12.0
+  version: 2.12.1
   displayName: Kubernetes monitoring
   description: Native deployment and management of Prometheus along with Kubernetes cluster monitoring components.
   docMarkDownUrl: https://raw.githubusercontent.com/cloudoperators/greenhouse-extensions/main/kube-monitoring/README.md
   icon: https://raw.githubusercontent.com/cloudoperators/greenhouse-extensions/main/kube-monitoring/logo.png
   helmChart:
     name: kube-monitoring
     repository: oci://ghcr.io/cloudoperators/greenhouse-extensions/charts
-    version: 0.25.0
+    version: 0.25.1
   options:
     - name: global.commonLabels
       description: Labels to add to all resources. This can be used to add a support group or service to all alerts.
@@ -95,3 +95,8 @@ spec:
       default: true
       required: false
       type: bool
+    - name: blackboxExporter
+      description: Deploys the Prometheus exporter for blackbox testing
+      default: false
+      required: false
+      type: bool