Barman
Dashboard for postgres-barman exporter
https://github.com/ahes/prometheus-barman-exporter
You are strongly recommened to try the new dashboard: https://grafana.com/grafana/dashboards/13918

It suports monitoring multiple servers, giving you a summary view.
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        },
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        }
      ],
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        "alignLevel": null
      }
    },
    {
      "aliasColors": {},
      "bars": false,
      "dashLength": 10,
      "dashes": false,
      "datasource": "${DS_PROMETHEUS}",
      "fieldConfig": {
        "defaults": {
          "custom": {},
          "links": []
        },
        "overrides": []
      },
      "fill": 0,
      "fillGradient": 0,
      "gridPos": {
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      },
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      },
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      "nullPointMode": "null",
      "options": {
        "alertThreshold": true
      },
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      "pluginVersion": "7.3.7",
      "pointradius": 2,
      "points": false,
      "renderer": "flot",
      "seriesOverrides": [
        {
          "alias": ""
        }
      ],
      "spaceLength": 10,
      "stack": false,
      "steppedLine": false,
      "targets": [
        {
          "expr": "barman_backups_total{server=\"$server\"} - barman_backups_failed{server=\"$server\"}\n",
          "format": "time_series",
          "interval": "15m",
          "intervalFactor": 1,
          "legendFormat": "",
          "refId": "A"
        }
      ],
      "thresholds": [],
      "timeFrom": null,
      "timeRegions": [],
      "timeShift": null,
      "title": "Number of available backups",
      "tooltip": {
        "shared": true,
        "sort": 0,
        "value_type": "individual"
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      "type": "graph",
      "xaxis": {
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      }
    }
  ],
  "refresh": "5s",
  "schemaVersion": 26,
  "style": "dark",
  "tags": [],
  "templating": {
    "list": [
      {
        "allValue": null,
        "current": {},
        "datasource": "${DS_PROMETHEUS}",
        "definition": "label_values(barman_up, server)",
        "error": null,
        "hide": 0,
        "includeAll": false,
        "label": "Server name",
        "multi": false,
        "name": "server",
        "options": [],
        "query": "label_values(barman_up, server)",
        "refresh": 1,
        "regex": "",
        "skipUrlSync": false,
        "sort": 1,
        "tagValuesQuery": "",
        "tags": [],
        "tagsQuery": "",
        "type": "query",
        "useTags": false
      }
    ]
  },
  "time": {
    "from": "now-5m",
    "to": "now"
  },
  "timepicker": {
    "refresh_intervals": [
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      "10s",
      "30s",
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      "5m",
      "15m",
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    ],
    "time_options": [
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    ]
  },
  "timezone": "",
  "title": "Barman",
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}