feat: document support for blackfire in paas native

[Shadrack Nicholas (shadracnicholas)]

Summary

Documents the Blackfire integration for Shopware PaaS Native.

• Adds products/paas/shopware/monitoring/blackfire.md covering the full setup.
• Updates monitoring/index.md, which previously stated that Blackfire is not supported.
• Adds a services.blackfire reference section to fundamentals/application-yaml.md.

Related links

• blackfire docs

Checklist

• I reviewed affected links, code samples, and cross-references, including PageRef references where relevant.
• I added or updated redirects in .gitbook.yaml if pages were moved, renamed, or deleted.
• I updated .wordlist.txt (and sorted it) if spellcheck flags new legitimate terms.
• Any required dependent changes in downstream modules have already been merged and published.
• This pull request is ready for review.

Notes

Four points are called out deliberately in the new page because they are easy to get wrong:

• Server ID / Server Token are the agent credentials and belong in the vault. Client ID / Client Token are personal and belong in the browser extension. Mixing them up produces a confusing failure.
• Both secrets must exist before enabling the service. A missing one fails the whole deployment, not just profiling.
• Blackfire and OpenTelemetry tracing are mutually exclusive, so Tempo stays empty in Grafana while Blackfire is enabled.
• The page also notes that CDN cached pages cannot be profiled, since a cached response never reaches PHP.

[shopware-dev-docs-connector]

Developer Docs healthcheck

Status: Completed with success.
Repository: shopware/docs
Commit: 07b3d9d
Preview: https://developer-documentation-44rt0woug-shopware-frontends.vercel.app
Workflow run: #5091

[github-actions]

📢 Developer Announcement Recommendation

Recommendation: ❌ No Announcement Recommended

No developer announcement signals were detected.

This PR does not appear to introduce developer-facing changes that require a community announcement.

[Copilot]

Pull request overview

This PR updates the Shopware PaaS Native documentation to reflect and explain support for Blackfire profiling, adding a dedicated setup guide and updating related reference/index pages.

Changes:

• Adds a new Blackfire profiling setup page for Shopware PaaS Native.
• Updates the Monitoring overview to state that Blackfire is supported and links to the new page.
• Extends the application.yaml reference with a services.blackfire section.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
products/paas/shopware/monitoring/index.md	Updates Monitoring overview messaging to reflect Blackfire support and links to the new page.
products/paas/shopware/monitoring/blackfire.md	New documentation page describing Blackfire setup, required secrets, enablement, and usage constraints.
products/paas/shopware/fundamentals/application-yaml.md	Adds reference documentation for services.blackfire configuration and links to the setup guide.

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[Micha Hobert (Isengo1989)]

Thank you for the PR Shadrack Nicholas (@shadracnicholas) 👍