feat(pgbouncer): allow configuring pgbouncer-exporter connection

This commit introduces the ability to configure the pgbouncer-exporter
connection string parameters, including host, port, database, sslmode,
and connect_timeout.

This addresses issue #25.

Author: masterkain

charts/pgbouncer/templates/deployment.yaml

@@ -30,7 +30,7 @@ spec:
         checksum/config: {{ include (print $.Template.BasePath "/configmap.yaml") . | sha256sum }}
         {{- if .Values.pgbouncerExporter.enabled }}
         prometheus.io/scrape: "true"
-        prometheus.io/port: "{{ .Values.pgbouncerExporter.port }}"
+        prometheus.io/port: "{{ .Values.pgbouncerExporter.servicePort }}"
         prometheus.io/path: "/metrics"
         {{- end }}
         {{- range $key, $value := .Values.podAnnotations }}
@@ -135,11 +135,11 @@ spec:
         image: {{ template "pgbouncer.exporterImage" . }}
         imagePullPolicy: {{ .Values.pgbouncerExporter.image.pullPolicy }}
         args:
-        - --web.listen-address=:{{ .Values.pgbouncerExporter.port }}
+        - --web.listen-address=:{{ .Values.pgbouncerExporter.servicePort }}
         - --web.telemetry-path=/metrics
         - --log.level={{ .Values.pgbouncerExporter.log.level }}
         - --log.format={{ .Values.pgbouncerExporter.log.format }}
-        - --pgBouncer.connectionString=postgres://$(PGBOUNCER_USER):$(PGBOUNCER_PASS)@127.0.0.1:5432/pgbouncer?sslmode=disable&connect_timeout=10
+        - --pgBouncer.connectionString=postgres://$(PGBOUNCER_USER):$(PGBOUNCER_PASS)@{{ .Values.pgbouncerExporter.host }}:{{ .Values.pgbouncerExporter.port }}/{{ .Values.pgbouncerExporter.database }}?sslmode={{ .Values.pgbouncerExporter.sslmode }}&connect_timeout={{ .Values.pgbouncerExporter.connect_timeout }}
         env:
         - name: PGBOUNCER_USER
           valueFrom:

charts/pgbouncer/values.yaml

@@ -229,8 +229,13 @@ pgbouncerExporter:
   imagePullSecrets: []
   # -- Whether to create a PodMonitor for scraping metrics (Prometheus Operator).
   podMonitor: false
+  host: 127.0.0.1
+  port: 5432
+  database: pgbouncer
+  sslmode: "disable"
+  connect_timeout: 10
   # -- The container port for the exporter.
-  port: 9127
+  servicePort: 9127
   image:
     # -- Exporter image registry
     registry: ""