Grafana dashboard: Tarantool dashboard
Description: Dashboard for Tarantool application and database server monitoring, based on grafonnet library.

# About project
This dashboard is based on [grafonnet](https://github.com/grafana/grafonnet-lib) library. Sources are available in project's [GitHub page](https://github.com/tarantool/grafana-dashboard).

# Configuration
The dashboard is designed to work with *Tarantool* + *Telegraf* + *InfluxDB* + *Grafana* cluster.

## Tarantool configuration

The dashboard is designed to work with Tarantool [__metrics__](https://github.com/tarantool/metrics) module (v0.15.1 or newer is needed for complete experience). It is recommended to use _metrics_ role (refer to _cartridge.roles.metrics_ role [page](https://www.tarantool.io/en/doc/latest/book/monitoring/getting_started/#cartridge-role) for instructions). Be sure to set _alias_ for every Tarantool instance (e.g. by environment variable _TARANTOOL_ALIAS_) so metrics will be splitted and displayed correctly.

Cartridge must be configured to have a *prometheus* metrics endpoint for Prometheus (refer to _cartridge.roles.metrics_ role [page](https://www.tarantool.io/en/doc/latest/book/monitoring/getting_started/#cartridge-role) for instructions). For HTTP panels, HTTP routing middleware with summary collector must be enabled. (See more on HTTP middleware in metrics [documentation](https://www.tarantool.io/en/doc/latest/book/monitoring/api_reference/#collecting-http-requests-latency-statistics) and Cartridge role [example](https://github.com/tarantool/grafana-dashboard/blob/master/example/project/app/roles/custom.lua).)

To support [__CRUD__](https://github.com/tarantool/crud) statistics, install CRUD 0.11.1 or newer. Call `crud.cfg{stats = true,  stats_driver='metrics', stats_quantiles=true}` on router to enable CRUD statistics collect with latency quantiles.

To support [__expirationd__](https://github.com/tarantool/expirationd) statistics, install expirationd 1.2.0 or newer. Call `expirationd.cfg{metrics = true}` on instance to enable statistics export.

## Telegraf configuration

Telegraf must be configured to have `data_format` set as *"json"* and `fieldpass` list set as *["value"]*; `tag_keys` list must contain *"metric_name"*, *"label_pairs_alias"*, *"label_pairs_quantile"*, *"label_pairs_path"*, *"label_pairs_method"*, *"label_pairs_status"*, *"label_pairs_operation"*, *"label_pairs_level"*, *"label_pairs_id"*, *"label_pairs_engine"*, *"label_pairs_name"*, *"label_pairs_index_name"*, *"label_pairs_delta"*, *"label_pairs_stream"* values. You can also check out example config on [GitHub](https://github.com/tarantool/grafana-dashboard/blob/master/example_cluster/telegraf/telegraf.conf).

# Dashboard
Metrics used in dashboard are based on Tarantool [metrics](https://github.com/tarantool/metrics) module.
Time series are grouped by *alias* parameter, so you can use this dashboard to monitor a cluster of Tarantool instances.

Dashboard contains the following sections:
* Cluster overview
* Replication overview
* Tarantool HTTP statistics
* Tarantool network activity
* Tarantool memtx allocation overview
* Tarantool MVCC overview
* Tarantool vinyl statistics
* Tarantool CPU statistics
* Tarantool runtime overview
* Tarantool LuaJit statistics
* Tarantool operations statistics
* CRUD module statistics
* expirationd module statistics

## Cluster overview
Contains panels on [Cartridge issues](https://www.tarantool.io/en/doc/latest/book/cartridge/cartridge_api/modules/cartridge.issues/) count, read only status and switchover triggers, election info.

## Replication overview
Contains info about replication lag and status, clock delta and synchronous queue statistics.

## Tarantool HTTP statistics
Overview of processed HTTP requests on Tarantool's side, grouped by method, path and response code. There are two lines of panels: one on rps and the other on 99th percentile of latency.

## Tarantool network activity
Overview of instances network activity. Displays input and output data load, as well as network connections, detailed requests stats and memory consumption.

## Tarantool memtx allocation overview
Overview of Tarantool memtx memory allocation (tuples and indexes). Contains short instruction on memory allocation monitoring. You can read more about *slab* [here](https://www.tarantool.io/en/doc/latest/reference/reference_lua/box_slab/#lua-function.box.slab.info).

## Tarantool MVCC overview
Contains statistics of Tarantool memtx engine transactions manager.

## Tarantool vinyl statistics
Overview of Tarantool vinyl memory and disk allocation, vinyl scheduler process and transaction statistics. You can read more about *vinyl engine* [here](https://www.tarantool.io/en/doc/latest/reference/reference_lua/box_slab/#lua-function.box.slab.info).

## Tarantool CPU statistics
Contains CPU process time statistics for each instance.

## Tarantool runtime overview
Metrics related to runtime. Contains Lua and transaction memory panels, fiber statistics panels and event loop panel.

## Tarantool LuaJit statistics
Detailed Lua runtime overview. Contains panels about objects allocation and garbage collect, memory consumption and LuaJit traces info.

## Tarantool operations statistics
Overview of operations on Tarantool spaces (select, update, etc.) aggregated over all Tarantool spaces, as well as other operations activity (eval, call, auth, errors and SQL calls).

## CRUD module statistics
Overview of [__CRUD__](https://github.com/tarantool/crud) module operations (crud.insert, crud.select, etc) separated by operation, cluster space and execution status. Contains RPS graphs, latency graphs and graphs with SELECT/PAIRS operations detailed info.

## expirationd module statistics
Overview of [__expirationd__](https://github.com/tarantool/expirationd) module jobs: tuples statistics, restarts count and working time.

# Contributing
Project is open-sourced, so you can freely file an issue with suggestion or bug report to our [GitHub page](https://github.com/tarantool/grafana-dashboard).

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                ]
              ],
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                {
                  "key": "metric_name",
                  "operator": "=",
                  "value": "tnt_stats_op_total"
                },
                {
                  "condition": "AND",
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                  "operator": "=~",
                  "value": "/^$alias$/"
                },
                {
                  "condition": "AND",
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                  "operator": "=",
                  "value": "commit"
                }
              ]
            }
          ],
          "thresholds": [],
          "timeFrom": null,
          "timeShift": null,
          "title": "Transaction commits",
          "tooltip": {
            "shared": true,
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            "value_type": "individual"
          },
          "type": "graph",
          "xaxis": {
            "buckets": null,
            "mode": "time",
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            "y": 397
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          "points": false,
          "renderer": "flot",
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          "stack": false,
          "steppedLine": false,
          "targets": [
            {
              "alias": "$tag_label_pairs_alias",
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                    "$__interval"
                  ],
                  "type": "time"
                },
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                  "params": [
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                },
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              ]
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          ],
          "thresholds": [],
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      "repeatRowId": null,
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      "collapsed": true,
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          "dashes": false,
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              ]
            }
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          "timeShift": null,
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          ]
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          "dashes": false,
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          "fill": 0,
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              ]
            }
          ],
          "thresholds": [],
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          },
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                },
                {
                  "condition": "AND",
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                  "value": "error"
                }
              ]
            }
          ],
          "thresholds": [],
          "timeFrom": null,
          "timeShift": null,
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            "shared": true,
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          },
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            "mode": "time",
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          ]
        },
        {
          "aliasColors": {},
          "bars": false,
          "dashLength": 10,
          "dashes": false,
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          "fill": 0,
          "gridPos": {
            "h": 8,
            "w": 8,
            "x": 0,
            "y": 414
          },
          "id": 166,
          "legend": {
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            "avg": true,
            "current": true,
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                  "type": "time"
                },
                {
                  "params": [
                    "none"
                  ],
                  "type": "fill"
                }
              ],
              "policy": "default",
              "query": "SELECT mean(\"tnt_crud_tuples_fetched\") / (mean(\"tnt_crud_stats_count_ok\") + mean(\"tnt_crud_stats_count_error\"))\nas \"tnt_crud_tuples_per_request\" FROM\n(SELECT \"value\" as \"tnt_crud_tuples_fetched\" FROM \"$policy\".\"$measurement\"\nWHERE (\"metric_name\" = 'tnt_crud_tuples_fetched' AND \"label_pairs_alias\" =~ /^$alias$/ AND \"label_pairs_operation\" = 'select') AND $timeFilter),\n(SELECT \"value\" as \"tnt_crud_stats_count_error\" FROM \"$policy\".\"$measurement\"\nWHERE (\"metric_name\" = 'tnt_crud_stats_count' AND \"label_pairs_alias\" =~ /^$alias$/ AND \"label_pairs_operation\" = 'select' AND \"label_pairs_status\" = 'error') AND $timeFilter),\n(SELECT \"value\" as \"tnt_crud_stats_count_ok\" FROM \"$policy\".\"$measurement\"\nWHERE (\"metric_name\" = 'tnt_crud_stats_count' AND \"label_pairs_alias\" =~ /^$alias$/ AND \"label_pairs_operation\" = 'select' AND \"label_pairs_status\" = 'ok') AND $timeFilter)\nGROUP BY time($__interval * 2), \"label_pairs_alias\", \"label_pairs_name\" fill(0)\n",
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              "refId": "A",
              "resultFormat": "time_series",
              "select": [],
              "tags": []
            }
          ],
          "thresholds": [],
          "timeFrom": null,
          "timeShift": null,
          "title": "SELECT tuples fetched",
          "tooltip": {
            "shared": true,
            "sort": 2,
            "value_type": "individual"
          },
          "type": "graph",
          "xaxis": {
            "buckets": null,
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