Add liveness and readiness probes to postgre_exporter (#7502)

Signed-off-by: Maxime Guyot <Miouge1@users.noreply.github.com>

stable/postgresql/Chart.yaml

@@ -1,5 +1,5 @@
 name: postgresql
-version: 0.17.0
+version: 0.18.0
 appVersion: 9.6.2
 description: Object-relational database management system (ORDBMS) with an emphasis on extensibility and on standards-compliance.
 keywords:

stable/postgresql/templates/deployment.yaml

@@ -138,6 +138,14 @@ spec:
             mountPath: /conf
             readOnly: true
         {{- end }}
+        livenessProbe:
+          httpGet:
+            path: /metrics
+            port: metrics
+        readinessProbe:
+          httpGet:
+            path: /metrics
+            port: metrics
         resources:
 {{ toYaml .Values.metrics.resources | indent 10 }}
 {{- end }}