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Query Monitor Headless · Wp Performance · WordPress/agent-skills · Skills Docs

Repo No. 26 · Wp Performance

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19 skills · 52 min

Skill 11 · Wp Performance

Subchapter 11.7

Query Monitor Headless

references/query-monitor-headless.mdMarkdown1 KBView on GitHub

Query Monitor (headless / backend-only)

Query Monitor is UI-first, but it can expose useful data to backend-only tooling.

What it can show

11Up to skill 11Wp Performance

On this page

Query Monitor (headless / backend-only)
What it can show
REST API requests (no browser needed)
Guardrails

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11.11Perf Inspect

Appendix · 11 subchapters

Query Monitor can help debug:

DB queries (slow/dupes/errors), hooks/actions, HTTP API calls, PHP errors

Plugin page:

https://wordpress.org/plugins/query-monitor/ (opens in a new tab)

Configuration constants:

https://querymonitor.com/help/configuration-constants/ (opens in a new tab)

REST API requests (no browser needed)

Query Monitor can add performance/error info to authenticated REST responses.

Docs:

https://querymonitor.com/wordpress-debugging/rest-api-requests/ (opens in a new tab)

High-level approach:

Authenticate (nonce or Application Password).
Make a REST request and inspect response headers like x-qm-overview-*.
If you request an enveloped response (?_envelope), you can get a qm property with:
- DB queries details, cache stats, HTTP API request details, etc.

Guardrails

Query Monitor adds some overhead; don’t enable it in production without approval.
If it’s already installed by your platform (e.g. VIP), you may need to grant view_query_monitor.

ReferenceObject Cache ReferenceServer Timing

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