Grafana dashboard: PostgreSQL DB/Table Size Details (Designed for PMM2)
Description: This dashboard gives an overview of database and table sizes and their rate of growth. Based on the output from the pg_class catalog.


This dashboard gives an overview of database and table sizes and their rate of growth. The output from the pg_class catalog requires a custom query to be added to your environment.

Custom query can be found in https://raw.githubusercontent.com/Percona-Lab/pmm-custom-queries/master/postgresql/pg_table_size-details.yaml and should be placed in the /usr/local/percona/pmm2/collectors/custom-queries/postgresql/low-resolution directory. 

------------------
If you’re using a PMM version older than 2.16.0, use the following instructions:

We propose to use our bash script (https://github.com/Percona-Lab/pmm-custom-queries/blob/master/postgresql/postgres_query_pg_class_generator.sh) that generates a query and forms other fields for a custom query file. You have to specify the database name, or names, that will be monitored. You can store the script result in a separate file or extend an existing file with queries.
$ ./postgres_query_pg_class_generator.sh sbtest sbtest2 >> queries-postgres-2.yml
Next metrics are collected: pg_class_table_rows pg_class_disk_usage_table_bytes pg_class_disk_usage_index_bytes pg_class_disk_usage_toast_bytes


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      "pieType": "pie",
      "pluginVersion": "6.5.1",
      "strokeWidth": 1,
      "targets": [
        {
          "expr": "topk(5,pg_class_disk_usage_index_bytes{datname=~\"$db\",service_name=~\"$service_name\"})",
          "interval": "$interval",
          "legendFormat": "{{datname}} - {{relname}}",
          "refId": "A"
        }
      ],
      "timeFrom": null,
      "timeShift": null,
      "title": "Top Tables by  Index",
      "type": "grafana-piechart-panel",
      "valueName": "current"
    },
    {
      "aliasColors": {},
      "breakPoint": "50%",
      "cacheTimeout": null,
      "combine": {
        "label": "Others",
        "threshold": 0
      },
      "datasource": "${DS_PROMETHEUS}",
      "decimals": 2,
      "fontSize": "80%",
      "format": "bytes",
      "gridPos": {
        "h": 7,
        "w": 12,
        "x": 12,
        "y": 42
      },
      "id": 1054,
      "interval": null,
      "legend": {
        "show": true,
        "sort": "current",
        "sortDesc": true,
        "values": true
      },
      "legendType": "Right side",
      "links": [],
      "maxDataPoints": 3,
      "nullPointMode": "connected",
      "options": {},
      "pieType": "pie",
      "pluginVersion": "6.5.1",
      "strokeWidth": 1,
      "targets": [
        {
          "expr": "topk(5,pg_class_disk_usage_toast_bytes{datname=~\"$db\",service_name=~\"$service_name\"})\n",
          "interval": "$interval",
          "legendFormat": "{{datname}} - {{relname}}",
          "refId": "A"
        }
      ],
      "timeFrom": null,
      "timeShift": null,
      "title": "Top Tables by  Toast",
      "type": "grafana-piechart-panel",
      "valueName": "current"
    }
  ],
  "refresh": "1m",
  "schemaVersion": 21,
  "style": "dark",
  "tags": [
    "Percona",
    "Posgresql"
  ],
  "templating": {
    "list": [
      {
        "allFormat": "glob",
        "auto": true,
        "auto_count": 200,
        "auto_min": "1s",
        "current": {
          "selected": false,
          "text": "auto",
          "value": "$__auto_interval_interval"
        },
        "datasource": "Prometheus",
        "hide": 0,
        "includeAll": false,
        "label": "Interval",
        "multi": false,
        "multiFormat": "glob",
        "name": "interval",
        "options": [
          {
            "selected": true,
            "text": "auto",
            "value": "$__auto_interval_interval"
          },
          {
            "selected": false,
            "text": "1s",
            "value": "1s"
          },
          {
            "selected": false,
            "text": "5s",
            "value": "5s"
          },
          {
            "selected": false,
            "text": "1m",
            "value": "1m"
          },
          {
            "selected": false,
            "text": "5m",
            "value": "5m"
          },
          {
            "selected": false,
            "text": "1h",
            "value": "1h"
          },
          {
            "selected": false,
            "text": "6h",
            "value": "6h"
          },
          {
            "selected": false,
            "text": "1d",
            "value": "1d"
          }
        ],
        "query": "1s,5s,1m,5m,1h,6h,1d",
        "refresh": 2,
        "skipUrlSync": false,
        "type": "interval"
      },
      {
        "allFormat": "glob",
        "allValue": null,
        "current": {},
        "datasource": "${DS_PROMETHEUS}",
        "definition": "label_values(pg_up,node_name)",
        "hide": 0,
        "includeAll": true,
        "label": "Node Name",
        "multi": true,
        "multiFormat": "regex values",
        "name": "node_name",
        "options": [],
        "query": "label_values(pg_up,node_name)",
        "refresh": 2,
        "refresh_on_load": false,
        "regex": "",
        "skipUrlSync": false,
        "sort": 1,
        "tagValuesQuery": "instance",
        "tags": [],
        "tagsQuery": "up",
        "type": "query",
        "useTags": false
      },
      {
        "allValue": null,
        "current": {},
        "datasource": "${DS_PROMETHEUS}",
        "definition": "label_values(pg_up{node_name=~\"$node_name\"}, service_name)",
        "hide": 0,
        "includeAll": true,
        "label": "Service Name",
        "multi": true,
        "name": "service_name",
        "options": [],
        "query": "label_values(pg_up{node_name=~\"$node_name\"}, service_name)",
        "refresh": 2,
        "regex": "",
        "skipUrlSync": false,
        "sort": 0,
        "tagValuesQuery": "",
        "tags": [],
        "tagsQuery": "",
        "type": "query",
        "useTags": false
      },
      {
        "allValue": null,
        "current": {},
        "datasource": "${DS_PROMETHEUS}",
        "definition": "label_values(pg_stat_database_tup_fetched{service_name=~\"$service_name\",datname!~\"template.*|postgres\"},datname)",
        "hide": 0,
        "includeAll": true,
        "label": "Database",
        "multi": true,
        "name": "db",
        "options": [],
        "query": "label_values(pg_stat_database_tup_fetched{service_name=~\"$service_name\",datname!~\"template.*|postgres\"},datname)",
        "refresh": 2,
        "regex": "",
        "skipUrlSync": false,
        "sort": 0,
        "tagValuesQuery": "",
        "tags": [],
        "tagsQuery": "",
        "type": "query",
        "useTags": false
      }
    ]
  },
  "time": {
    "from": "now-12h",
    "to": "now"
  },
  "timepicker": {
    "collapse": false,
    "enable": true,
    "hidden": false,
    "notice": false,
    "now": true,
    "refresh_intervals": [
      "5s",
      "10s",
      "30s",
      "1m",
      "5m",
      "15m",
      "30m",
      "1h",
      "2h",
      "1d"
    ],
    "status": "Stable",
    "time_options": [
      "5m",
      "15m",
      "1h",
      "6h",
      "12h",
      "24h",
      "2d",
      "7d",
      "30d"
    ],
    "type": "timepicker"
  },
  "timezone": "browser",
  "title": "PostgreSQL DB/Table Size Details (Designed for PMM2)",
  "uid": "MZmZAj-Zk",
  "version": 3
}