[system] Add MongoDB Grafana dashboards by IvanHunters · Pull Request #2158 · cozystack/cozystack

IvanHunters · 2026-03-05T19:46:57Z

What this PR does

Adds two Grafana dashboards for MongoDB monitoring, adapted to cozystack conventions:

MongoDB Overview — command operations, connections, cursors, document operations, queued operations, query efficiency, scanned objects, write time/operations, asserts, page faults
MongoDB InMemory Details — WiredTiger cache size/capacity, dirty pages, transactions, sessions, pages, concurrency tickets, cache eviction, document changes, scanned objects, page faults

Key adaptations from the original PMM dashboards:

Replaced hardcoded datasource UIDs with ${ds_prometheus} variable
Replaced PMM-specific variables with standard job-based service filtering
Removed Node Summary section (covered by existing node dashboards)
Registered both dashboards in dashboards.list for automatic GrafanaDashboard CRD generation

Release note

[system] Add MongoDB Overview and MongoDB InMemory Details Grafana dashboards to the monitoring stack

Summary by CodeRabbit

New Features
- Added MongoDB InMemory dashboard providing detailed visibility into in-memory metrics, cache performance, and data management.
- Added MongoDB Overview dashboard for monitoring operations, connections, cursors, document activity, and query efficiency.

gemini-code-assist · 2026-03-05T19:47:10Z

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances MongoDB monitoring capabilities by introducing two new Grafana dashboards. These dashboards provide detailed insights into MongoDB's operational metrics and WiredTiger in-memory performance, ensuring better visibility and easier troubleshooting for MongoDB instances within the system. The integration follows established conventions for datasource and service filtering, streamlining the monitoring setup.

Highlights

New MongoDB Grafana Dashboards: Two new Grafana dashboards, 'MongoDB Overview' and 'MongoDB InMemory Details', have been added for comprehensive MongoDB monitoring.
CozyStack Convention Adaptation: The dashboards were adapted to cozystack conventions by replacing hardcoded datasource UIDs with a ${ds_prometheus} variable and using standard job-based service filtering.
Node Summary Removal: The Node Summary section was removed from the dashboards as this information is already covered by existing node dashboards.
Automatic Dashboard Generation: Both new dashboards are registered in dashboards.list to enable automatic GrafanaDashboard CRD generation.

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Changelog

dashboards/mongodb/mongodb-inmemory.json
- Added a new Grafana dashboard for MongoDB WiredTiger InMemory Details.
dashboards/mongodb/mongodb-overview.json
- Added a new Grafana dashboard for MongoDB Overview.
packages/system/monitoring/dashboards.list
- Added entries for the new 'mongodb-overview' and 'mongodb-inmemory' dashboards to the list of available dashboards.

Activity

No human activity has been recorded on this pull request yet.

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coderabbitai · 2026-03-05T19:47:19Z

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

Two new MongoDB Grafana dashboards are added: mongodb-overview with 13 panels covering operational metrics, and mongodb-inmemory with 9 panels focusing on in-memory storage details. Both dashboards are registered in the dashboard manifest and configured to use Prometheus as the data source.

Changes

Cohort / File(s)	Summary
MongoDB Dashboards `dashboards/mongodb/mongodb-overview.json`, `dashboards/mongodb/mongodb-inmemory.json`	New Grafana dashboard configurations for MongoDB monitoring. Overview dashboard tracks operations, connections, cursors, document metrics, and query efficiency across 13 panels. In-memory dashboard monitors cache, transactions, evictions, and page faults across 9 panels. Both use Prometheus metrics and include templated variables for datasource and job selection.
Dashboard Registry `packages/system/monitoring/dashboards.list`	Manifest file updated to register the two new MongoDB dashboards (mongodb-overview and mongodb-inmemory) for inclusion in the monitoring system.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~22 minutes

Poem

🐰 New dashboards hop into view,
MongoDB metrics shining through,
In-memory pages, overview wise,
Prometheus data before our eyes! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title '[system] Add MongoDB Grafana dashboards' accurately summarizes the main change: adding two new Grafana dashboard configuration files for MongoDB monitoring to the system.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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Commit unit tests in branch feat/mongodb-grafana-dashboards

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Add two MongoDB dashboards adapted for cozystack monitoring: - mongodb-overview: command operations, connections, cursors, document operations, queued operations, query efficiency, scanned objects, write time, asserts, page faults - mongodb-inmemory: WiredTiger InMemory cache details including data size, capacity, transactions, sessions, pages, concurrency tickets, cache eviction, document changes Dashboards use ds_prometheus variable for datasource selection and job-based service filtering compatible with Percona MongoDB exporter metrics. Signed-off-by: IvanHunters <[email protected]>

Add mongodb/mongodb-overview and mongodb/mongodb-inmemory entries to the monitoring dashboards list so GrafanaDashboard CRDs are generated and dashboards are served by the grafana-dashboards HTTP service. Signed-off-by: IvanHunters <[email protected]>

gemini-code-assist

Code Review

This pull request introduces two new Grafana dashboards for MongoDB monitoring: 'MongoDB Overview' and 'MongoDB InMemory Details'. The dashboards are well-structured and provide valuable insights into MongoDB performance. My review focuses on improving the consistency and efficiency of the PromQL queries within the dashboard definitions. I've suggested using instant queries for stat panels where appropriate and replacing hardcoded time intervals with the dashboard's $interval variable for better dynamic control and maintainability. These changes will make the dashboards cleaner and more consistent.

gemini-code-assist · 2026-03-05T19:49:28Z

dashboards/mongodb/mongodb-inmemory.json

+          {
+            "datasource": {
+              "type": "prometheus",
+              "uid": "${ds_prometheus}"
+            },
+            "editorMode": "code",
+            "expr": "avg(mongodb_mongod_wiredtiger_cache_bytes{job=\"$job\", type=\"total\"})",
+            "interval": "5m",
+            "range": true,
+            "refId": "A"
+          }


For stat panels that should display the most recent value, it's more efficient and clearer to use an instant query. The current configuration uses a range query which is unnecessarily complex. Please use an instant query instead by applying the suggestion. Also, you should remove "timeFrom": "1m" on line 125 as it's related to the range query configuration.

{ "datasource": { "type": "prometheus", "uid": "${ds_prometheus}" }, "editorMode": "code", "expr": "avg(mongodb_mongod_wiredtiger_cache_bytes{job=\"$job\", type=\"total\"})", "refId": "A" }

gemini-code-assist · 2026-03-05T19:49:28Z

dashboards/mongodb/mongodb-inmemory.json

+          {
+            "datasource": {
+              "type": "prometheus",
+              "uid": "${ds_prometheus}"
+            },
+            "editorMode": "code",
+            "expr": "avg(mongodb_mongod_wiredtiger_cache_max_bytes{job=\"$job\"})",
+            "interval": "5m",
+            "range": true,
+            "refId": "A"
+          }


For stat panels that should display the most recent value, it's more efficient and clearer to use an instant query. The current configuration uses a range query which is unnecessarily complex. Please use an instant query instead by applying the suggestion. Also, you should remove "timeFrom": "1m" on line 211 as it's related to the range query configuration.

{ "datasource": { "type": "prometheus", "uid": "${ds_prometheus}" }, "editorMode": "code", "expr": "avg(mongodb_mongod_wiredtiger_cache_max_bytes{job=\"$job\"})", "refId": "A" }

gemini-code-assist · 2026-03-05T19:49:28Z

dashboards/mongodb/mongodb-inmemory.json

+              "uid": "${ds_prometheus}"
+            },
+            "expr": "1-(avg(mongodb_mongod_wiredtiger_cache_bytes{job=\"$job\", type=\"total\"})/avg(mongodb_mongod_wiredtiger_cache_max_bytes{job=\"$job\"}))",
+            "interval": "5m",


The interval property is not used for instant queries and can be removed for clarity.

gemini-code-assist · 2026-03-05T19:49:28Z

dashboards/mongodb/mongodb-inmemory.json

+              "uid": "${ds_prometheus}"
+            },
+            "expr": "avg(mongodb_mongod_wiredtiger_cache_pages{job=\"$job\",type=\"dirty\"})/avg(mongodb_mongod_wiredtiger_cache_pages{job=\"$job\",type=\"total\"})",
+            "interval": "5m",


The interval property is not used for instant queries and can be removed for clarity.

gemini-code-assist · 2026-03-05T19:49:28Z

dashboards/mongodb/mongodb-overview.json

+              "type": "prometheus",
+              "uid": "${ds_prometheus}"
+            },
+            "expr": "sum(increase(mongodb_mongod_metrics_query_executor_total{job=~\"$job\", state=\"scanned_objects\"}[5m]))/sum(increase(mongodb_mongod_metrics_document_total{job=~\"$job\", state=\"returned\"}[5m]))",


This query uses a hardcoded 5m time range. For consistency with other panels in this dashboard that use the $interval variable, please use $interval here as well. This allows the time range to be controlled dynamically.

Suggested change

"expr": "sum(increase(mongodb_mongod_metrics_query_executor_total{job=~\"$job\", state=\"scanned_objects\"}[5m]))/sum(increase(mongodb_mongod_metrics_document_total{job=~\"$job\", state=\"returned\"}[5m]))",

"expr": "sum(increase(mongodb_mongod_metrics_query_executor_total{job=~\"$job\", state=\"scanned_objects\"}[$interval]))/sum(increase(mongodb_mongod_metrics_document_total{job=~\"$job\", state=\"returned\"}[$interval]))",

gemini-code-assist · 2026-03-05T19:49:29Z

dashboards/mongodb/mongodb-overview.json

+              "type": "prometheus",
+              "uid": "${ds_prometheus}"
+            },
+            "expr": "sum(increase(mongodb_mongod_metrics_query_executor_total{job=~\"$job\", state=\"scanned\"}[5m]))/sum(increase(mongodb_mongod_metrics_document_total{job=~\"$job\", state=\"returned\"}[5m]))",


This query uses a hardcoded 5m time range. For consistency with other panels in this dashboard that use the $interval variable, please use $interval here as well. This allows the time range to be controlled dynamically.

Suggested change

"expr": "sum(increase(mongodb_mongod_metrics_query_executor_total{job=~\"$job\", state=\"scanned\"}[5m]))/sum(increase(mongodb_mongod_metrics_document_total{job=~\"$job\", state=\"returned\"}[5m]))",

"expr": "sum(increase(mongodb_mongod_metrics_query_executor_total{job=~\"$job\", state=\"scanned\"}[$interval]))/sum(increase(mongodb_mongod_metrics_document_total{job=~\"$job\", state=\"returned\"}[$interval]))",

IvanHunters added 2 commits March 5, 2026 22:47

IvanHunters force-pushed the feat/mongodb-grafana-dashboards branch from ebb19d9 to c838358 Compare March 5, 2026 19:48

gemini-code-assist bot reviewed Mar 5, 2026

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kvaps approved these changes Mar 6, 2026

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dosubot bot added the lgtm This PR has been approved by a maintainer label Mar 6, 2026

IvanHunters marked this pull request as ready for review March 6, 2026 11:46

IvanHunters requested review from androndo, lexfrei, lllamnyp and sircthulhu as code owners March 6, 2026 11:46

dosubot bot added size:XXL This PR changes 1000+ lines, ignoring generated files. enhancement New feature or request labels Mar 6, 2026

IvanHunters merged commit 8166df2 into main Mar 6, 2026
11 of 12 checks passed

IvanHunters deleted the feat/mongodb-grafana-dashboards branch March 6, 2026 11:53

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[system] Add MongoDB Grafana dashboards#2158

[system] Add MongoDB Grafana dashboards#2158
IvanHunters merged 2 commits intomainfrom
feat/mongodb-grafana-dashboards

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	"expr": "sum(increase(mongodb_mongod_metrics_query_executor_total{job=~\"$job\", state=\"scanned_objects\"}[5m]))/sum(increase(mongodb_mongod_metrics_document_total{job=~\"$job\", state=\"returned\"}[5m]))",
	"expr": "sum(increase(mongodb_mongod_metrics_query_executor_total{job=~\"$job\", state=\"scanned_objects\"}[$interval]))/sum(increase(mongodb_mongod_metrics_document_total{job=~\"$job\", state=\"returned\"}[$interval]))",

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