Set PG_EXPORTER_AUTO_DISCOVERY to true for the pg_exporter (#23)

* Enable the AUTO_DISCOVERY on the pg_exporter

* Fix the env var that should be text

* Make the autodiscovery optional

Author: allanger

charts/db-instances/Chart.yaml

@@ -2,4 +2,4 @@ apiVersion: v1
 appVersion: "1.0"
 description: Database Instances for db operator
 name: db-instances
-version: 2.0.0
+version: 2.1.0

charts/db-instances/ci/ci-test-service-monitor-values.yaml

@@ -4,6 +4,7 @@ dbinstances:
       enabled: true
     engine: postgres
     monitoring:
+      autodiscovery: true
       enabled: true
     generic:
       host: postgres-instance-postgresql.postgres

charts/db-instances/templates/postgres_exporter.yaml

@@ -44,6 +44,10 @@ spec:
           value: /run/cm/queries/queries.yaml
         - name: PG_EXPORTER_CONSTANT_LABELS
           value: dbinstance={{ $name }}
+        {{- if $value.monitoring.autodiscovery }}
+        - name: PG_EXPORTER_AUTO_DISCOVERY
+          value: "true"
+        {{- end }}
         image: {{ $exporter.image }}
         imagePullPolicy: Always
         name: exporter