CPS support in Synthetics

[shainaraskas]

Summary

Documents cross-project search (CPS) for Synthetics on Elastic Cloud Serverless. Linked-project monitors appear as read-only in the Synthetics UI after you link projects. Defers to the core CPS pages for the header selector and shared concepts.

CPS serverless: preview → GA tagging is out of scope.

I put Synthetics availability, the Observability CPS page, and the origin-only status and TLS rule limitation in #8004 because I am making changes to those same lines and want to avoid conflicts if possible. This PR is the Synthetics UI only.

Fixes #8098

Changes

• Analyze data: How linked-project monitors show up in the Synthetics UI. Moved CCS down because not everyone reading this page will care about CCS/CPS
• Manage monitors: Specified that management views do not include monitors from linked projects, points to linked project for synthetics management
• Configure Synthetics settings: Serverless note on Remote clusters (no explicit config from this page)
• Scale and architect: How to include monitor data from linked projects.

Related changes you can find in #8004

commit https://github.com/elastic/docs-content/pull/8004/changes/c3ef0efdd61fdf56112d0529772e06ebaf2abfdc..7965b5739e81fb3bbb67151922cd08d7c153440a

• Observability app compatibility, CPS manage scope: Observability availability, and Configure CPS: Limitations: Updated to say Synthetics is compatible with CPS and uses the header selector.
• CPS in Observability: Removed the Synthetics is not available section, indicated synthetics respects the header scope selector, grants view access to monitors in linked projects
• Rules data scope inconsistency: Synthetics status and TLS rules stay origin-only, even when the selector includes linked projects.

Sources

• [Internal]: Document Synthetics cross-project search (CPS) #8098
• [Synthetics] Enable cross-project search (CPS) kibana#286903

Related

• Observability availability: Updated CPS support for Observability apps #8004
• Defers to core CPS docs: CPS scope selector changes #7815
• Kibana work is already on main: [Synthetics] Enable cross-project search (CPS) kibana#286903

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No
  Tool(s) and model(s) used: cursor grok 4.6

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🔍 Preview links for changed docs

• solutions/observability/synthetics/analyze-data.md
• solutions/observability/synthetics/configure-settings.md
• solutions/observability/synthetics/manage-monitors.md
• solutions/observability/synthetics/scale-architect-synthetics-deployment.md

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File	Line	Rule	Message
solutions/observability/synthetics/analyze-data.md	291	Elastic.WordChoice	Consider using 'deactivate, deselect, hide, turn off' instead of 'disable', unless the term is in the UI.

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[nastasha-solomon]

I don't know enough about synthetics to do more than a cursory check. Since @mdbirnstiehl has more knowledge in this area, it might be worth getting a review from him as well.

[mdbirnstiehl]

LGTM!