Grafana dashboard: PostgreSQL Overview (Postgres_exporter)
Description: This dashboard works with postgres_exporter for prometheus

Source code:
https://github.com/patsevanton/postgresql_overview_postgres_exporter

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        "datasource": "${DS_PROMETHEUS}",
        "definition": "query_result(up{release=\"$release\"})",
        "hide": 0,
        "includeAll": false,
        "index": -1,
        "label": "Instance",
        "multi": false,
        "name": "instance",
        "options": [],
        "query": "query_result(up{release=\"$release\"})",
        "refresh": 1,
        "regex": "/.*instance=\"([^\"]+).*/",
        "skipUrlSync": false,
        "sort": 1,
        "tagValuesQuery": "",
        "tags": [],
        "tagsQuery": "",
        "type": "query",
        "useTags": false
      },
      {
        "allValue": null,
        "current": {},
        "datasource": "${DS_PROMETHEUS}",
        "definition": "label_values(datname)",
        "hide": 0,
        "includeAll": true,
        "index": -1,
        "label": "Database",
        "multi": true,
        "name": "datname",
        "options": [],
        "query": "label_values(datname)",
        "refresh": 1,
        "regex": "",
        "skipUrlSync": false,
        "sort": 1,
        "tagValuesQuery": "",
        "tags": [],
        "tagsQuery": "",
        "type": "query",
        "useTags": false
      },
      {
        "allValue": null,
        "current": {},
        "datasource": "${DS_PROMETHEUS}",
        "definition": "label_values({mode=~\"accessexclusivelock|accesssharelock|exclusivelock|rowexclusivelock|rowsharelock|sharelock|sharerowexclusivelock|shareupdateexclusivelock\"}, mode)",
        "hide": 0,
        "includeAll": true,
        "index": -1,
        "label": "Lock table",
        "multi": true,
        "name": "mode",
        "options": [],
        "query": "label_values({mode=~\"accessexclusivelock|accesssharelock|exclusivelock|rowexclusivelock|rowsharelock|sharelock|sharerowexclusivelock|shareupdateexclusivelock\"}, mode)",
        "refresh": 1,
        "regex": "",
        "skipUrlSync": false,
        "sort": 0,
        "tagValuesQuery": "",
        "tags": [],
        "tagsQuery": "",
        "type": "query",
        "useTags": false
      }
    ]
  },
  "time": {
    "from": "now-1h",
    "to": "now"
  },
  "timepicker": {
    "refresh_intervals": [
      "5s",
      "10s",
      "30s",
      "1m",
      "5m",
      "15m",
      "30m",
      "1h",
      "2h",
      "1d"
    ],
    "time_options": [
      "5m",
      "15m",
      "1h",
      "6h",
      "12h",
      "24h",
      "2d",
      "7d",
      "30d"
    ]
  },
  "timezone": "browser",
  "title": "PostgreSQL Overview (Postgres_exporter)",
  "uid": "5474745",
  "variables": {
    "list": []
  },
  "version": 1
}