[prometheus-postgres-exporter] Implement multiple target in service monitor (#5012)

* [prometheus-postgres-exporter] Implement multiple target with /probe endpoint

Signed-off-by: festeveira <[email protected]>

* Replace multipleTargets with multipleTarget

Signed-off-by: festeveira <[email protected]>

* Improve values.yaml documentation

Signed-off-by: festeveira <[email protected]>

* Remove /postgres path from target param in ServiceMonitor

Signed-off-by: festeveira <[email protected]>

---------

Signed-off-by: festeveira <[email protected]>
Signed-off-by: Francisco Esteveira <[email protected]>
Co-authored-by: MH <[email protected]>

Author: festeveira

charts/prometheus-postgres-exporter/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 appVersion: "v0.16.0"
 description: A Helm chart for prometheus postgres-exporter
 name: prometheus-postgres-exporter
-version: 6.6.0
+version: 6.7.0
 home: https://github.com/prometheus-community/postgres_exporter
 sources:
 - https://github.com/prometheus-community/postgres_exporter

charts/prometheus-postgres-exporter/templates/servicemonitor.yaml

@@ -12,6 +12,52 @@ metadata:
   namespace: {{ .Values.serviceMonitor.namespace }}
 {{- end }}
 spec:
+{{- if .Values.serviceMonitor.multipleTarget.enabled }}
+  endpoints:
+  {{- range  .Values.serviceMonitor.multipleTarget.targets }}
+    - path: /probe
+      port: {{ $.Values.service.name }}
+  {{- if $.Values.serviceMonitor.interval }}
+      interval: {{ $.Values.serviceMonitor.interval }}
+  {{- end }}
+  {{- if $.Values.serviceMonitor.timeout }}
+      scrapeTimeout: {{ $.Values.serviceMonitor.timeout }}
+  {{- end }}
+  {{- if $.Values.serviceMonitor.scheme }}
+      scheme: {{ $.Values.serviceMonitor.scheme }}
+  {{- end }}
+  {{- with $.Values.serviceMonitor.tlsConfig }}
+      tlsConfig:
+  {{- toYaml . | nindent 6 }}
+  {{- end }}
+      metricRelabelings:
+        - action: replace
+          replacement: {{ .endpoint }}
+          sourceLabels: [instance]
+          targetLabel: instance
+        - action: replace
+          replacement: {{ .name }}
+          sourceLabels: [target]
+          targetLabel: target
+      {{- if $.Values.serviceMonitor.metricRelabelings -}}
+        {{ toYaml $.Values.serviceMonitor.metricRelabelings | nindent 8 }}
+      {{- end }}
+  {{- if $.Values.serviceMonitor.relabelings }}
+      relabelings: {{ toYaml $.Values.serviceMonitor.relabelings | nindent 8 }}
+  {{- end }}
+      params:
+        target:
+          - {{ .endpoint }}:{{ .port | default 5432 }}
+        {{- if $.Values.serviceMonitor.multipleTarget.sharedAuthModule.enabled }}
+        auth_module:
+          - {{ $.Values.serviceMonitor.multipleTarget.sharedAuthModule.name }}
+        {{- else }}
+        auth_module:
+          - client.{{ .name }}
+        {{- end }}
+  {{- end }}
+{{- end }}
+{{- if not .Values.serviceMonitor.multipleTarget.enabled -}}
   endpoints:
   - port: {{ .Values.service.name }}
 {{- if .Values.serviceMonitor.interval }}
@@ -37,6 +83,7 @@ spec:
 {{- with .Values.serviceMonitor.tlsConfig }}
     tlsConfig:
 {{- toYaml . | nindent 6 }}
+{{- end }}
 {{- end }}
   jobLabel: {{ template "prometheus-postgres-exporter.fullname" . }}
   namespaceSelector:

charts/prometheus-postgres-exporter/values.yaml

@@ -50,6 +50,22 @@ serviceMonitor:
   # TLS configuration to use when scraping the metric endpoint by Prometheus.
   # tlsConfig: {}
 
+   # Use multipleTarget mode
+  multipleTarget:
+    enabled: false
+    # Use the same auth module for every target
+    # The config file should have a section like [$name]
+    sharedAuthModule:
+      enabled: false
+      name: ""
+
+    # Define each target's endpoint and name
+    # When not using sharedAuthModule the config file should have one authModule for each target with key "client.$name"
+    targets: []
+      # - endpoint: pg01.local
+      #   name: pg01 (there needs to exist an authModule with key "client.pg01" if not using sharedAuthModule)
+      #   port: default 5432
+
 prometheusRule:
   enabled: false
   additionalLabels: {}