[stable/prometheus-postgres-exporter] Add feature 'auto-discover-databases' (#17826)

Ref: https://github.com/wrouesnel/postgres_exporter#automatically-discover-databases

Signed-off-by: Frederic Hemberger <mail@frederic-hemberger.de>

stable/prometheus-postgres-exporter/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v1
 appVersion: "0.5.1"
 description: A Helm chart for prometheus postgres-exporter
 name: prometheus-postgres-exporter
-version: 1.0.0
+version: 1.1.0
 home: https://github.com/wrouesnel/postgres_exporter
 sources:
 - https://github.com/wrouesnel/postgres_exporter

stable/prometheus-postgres-exporter/README.md

@@ -57,6 +57,8 @@ The following table lists the configurable parameters of the postgres Exporter c
 | `config.datasource`                 | Postgresql datasource configuration                      |  see [values.yaml](values.yaml)              |
 | `config.queries`                | SQL queries that the exporter will run | [postgres exporter defaults](https://github.com/wrouesnel/postgres_exporter/blob/master/queries.yaml) |
 | `config.disableDefaultMetrics`  | Specifies whether to use only metrics from `queries.yaml`| `false` |
+| `config.autoDiscoverDatabases`  | Specifies whether to autodiscover all databases | `false` |
+| `config.excludeDatabases`  | When autodiscover is enabled, list databases to exclude| `[]` |
 | `rbac.create`                   | Specifies whether RBAC resources should be created.| `true` |
 | `rbac.pspEnabled`               | Specifies whether a PodSecurityPolicy should be created.| `true` |
 | `serviceAccount.create`         | Specifies whether a service account should be created.| `true` |

stable/prometheus-postgres-exporter/templates/deployment.yaml

@@ -28,7 +28,7 @@ spec:
         checksum/config: {{ include (print $.Template.BasePath "/configmap.yaml") . | sha256sum }}
 {{- if .Values.annotations }}
 {{ toYaml .Values.annotations | indent 8 }}
-{{- end}}
+{{- end }}
     spec:
       serviceAccountName: {{ template "prometheus-postgres-exporter.serviceAccountName" . }}
       containers:
@@ -38,6 +38,13 @@ spec:
           {{- if .Values.config.disableDefaultMetrics }}
           - "--disable-default-metrics"
           {{- end }}
+          {{- if .Values.config.autoDiscoverDatabases }}
+          - "--auto-discover-databases"
+          {{- if .Values.config.excludeDatabases }}
+          - "--exclude-databases"
+          - {{ .Values.config.excludeDatabases | join "," }}
+          {{- end }}
+          {{- end }}
           env:
           - name: DATA_SOURCE_URI
             value: {{ template "prometheus-postgres-exporter.data_source_uri" . }}

stable/prometheus-postgres-exporter/values.yaml

@@ -75,6 +75,8 @@ config:
     database: ''
     sslmode: disable
   disableDefaultMetrics: false
+  autoDiscoverDatabases: false
+  excludeDatabases: []
   # this are the defaults queries that the exporter will run, extracted from: https://github.com/wrouesnel/postgres_exporter/blob/master/queries.yaml
   queries: |-
     pg_replication: