Documentation cleanup and addition of query-exporter metrics

[richturner]

Various documentation improvements relating to the developer guide and also added documentation for the new query-exporter service and the metrics it generates

[richturner]

@wborn maybe best to quickly review these changes, I have tried to ensure links are maintained.

[wborn]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 7d63465a56

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[Copilot]

Pull request overview

This PR updates the documentation to (1) document new query-exporter / PostgreSQL metrics and (2) reorganize/consolidate parts of the Developer Guide (moving “ops/admin” content into a new System Administration page and adjusting navigation ordering).

Changes:

• Add PostgreSQL metrics documentation (via query-exporter) and update the metrics diagram endpoints.
• Introduce System Administration doc and retarget existing docs to the new locations (e.g., DB backup/restore link from Quick Start).
• Remove several older/duplicated Developer Guide pages and adjust sidebar_position ordering across multiple docs.

Reviewed changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
docs/user-guide/metrics.md	Updates metrics architecture diagram and adds a large new section documenting query-exporter PostgreSQL metrics.
docs/user-guide/deploying/release-management.md	Adds a note about CI/CD setting MANAGER_VERSION.
docs/user-guide/deploying/custom-deployment.md	Updates the agent/protocol documentation link and removes a “See Also” section.
docs/quick-start.md	Updates the DB backup/restore link to point to the new System Administration doc.
docs/developer-guide/working-on-ui-and-apps.md	Changes sidebar ordering.
docs/developer-guide/working-on-the-mobile-consoles.md	Changes sidebar ordering.
docs/developer-guide/working-on-maps.md	Changes sidebar ordering.
docs/developer-guide/useful-commands-and-queries.md	Removes this page (content appears consolidated elsewhere).
docs/developer-guide/system-administration.md	Adds new consolidated operations/admin guide (monitoring, JVM, DB, Docker, etc.).
docs/developer-guide/setting-up-an-ide.md	Streamlines IDE setup guidance; adds build/testing sections; adjusts structure and sidebar ordering.
docs/developer-guide/preparing-the-environment.md	Updates runtime tooling guidance and adjusts sidebar ordering.
docs/developer-guide/maintaining-an-installation.md	Removes this page (content appears consolidated into System Administration).
docs/developer-guide/licensing-guidelines-for-contributors.md	Updates copyright header example.
docs/developer-guide/installing-and-using-docker.md	Removes this page (Docker install guidance now points to upstream Docker docs).
docs/developer-guide/gateway-tunnelling-setup.md	Fixes a typo in a section header.
docs/developer-guide/docker-compose-profiles.md	Changes sidebar ordering.
docs/developer-guide/data-migration.md	Removes this page (content appears consolidated into System Administration).
docs/developer-guide/creating-a-custom-project.md	Changes sidebar ordering.
docs/developer-guide/connecting-protocol-adaptors-with-agents.md	Removes this page (replaced by the new SPI doc).
docs/developer-guide/building-and-testing.md	Removes this page (content moved into IDE setup doc).
docs/developer-guide/agent-protocol-spi.md	Adds a new, shorter Agent/Protocol SPI doc.
docs/developer-guide/adding-widgets-on-insights.md	Changes sidebar ordering.

Comments suppressed due to low confidence (1)

docs/developer-guide/system-administration.md:139

• The page alternates between openremote_postgresql_1 and or-postgresql-1 for the PostgreSQL container name. Please standardize on one naming scheme (or use a <PROJECT_NAME>_postgresql_1 placeholder) to avoid copy/paste failures.

Use the following docker command to access the database on the docker host:
```shell
docker exec -it openremote_postgresql_1 psql -U postgres

</details>



---

💡 <a href="/openremote/documentation/new/main?filename=.github/instructions/*.instructions.md" class="Link--inTextBlock" target="_blank" rel="noopener noreferrer">Add Copilot custom instructions</a> for smarter, more guided reviews. <a href="https://docs.github.com/en/copilot/customizing-copilot/adding-repository-custom-instructions-for-github-copilot" class="Link--inTextBlock" target="_blank" rel="noopener noreferrer">Learn how to get started</a>.

[richturner]

AI review has been resolved @openremote/core-developers ready for review please