Add Postgres exporter and it's dashboard

stack_orchestrator/data/compose/docker-compose-prom-server.yml

@@ -43,5 +43,15 @@ services:
     extra_hosts:
       - "host.docker.internal:host-gateway"
 
+  postgres-exporter:
+    image: quay.io/prometheuscommunity/postgres-exporter
+    restart: always
+    volumes:
+      - ../config/monitoring/postgres-exporter.yml:/postgres_exporter.yml
+    ports:
+      - '9187'
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
+
 volumes:
   prometheus_data:

stack_orchestrator/data/config/monitoring/postgres-exporter.yml

@@ -0,0 +1,8 @@
+auth_modules:
+  foo:
+    type: userpass
+    userpass:
+      username: username
+      password: password
+    options:
+      sslmode: disable

stack_orchestrator/data/config/monitoring/prometheus/prometheus.yml

@@ -40,3 +40,21 @@ scrape_configs:
     static_configs:
       - targets: ['chain-head-exporter:5000']
 
+  - job_name: 'postgres'
+    scrape_interval: 30s
+    scrape_timeout: 30s
+    static_configs:
+      # Add DB targets below
+      # - targets: [example-server:5432]
+        # labels:
+          # instance: 'example-label'
+    metrics_path: /probe
+    params:
+      auth_module: [foo]
+    relabel_configs:
+      - source_labels: [__address__]
+        target_label: __param_target
+      - source_labels: [__param_target]
+        target_label: instance
+      - target_label: __address__
+        replacement: postgres-exporter:9187