Mark direct Google IdP as not recommended for self-hosted

[mlsmaycon]

Follows up on netbirdio/netbird#8113 (comment): sending the client secret to clients is being deprecated, and using Google directly as the self-hosted IdP should be marked as not recommended in favor of the embedded IdP.

A direct Google setup depends on Management sending the OAuth client secret to every client (the deprecated ProviderConfig.ClientSecret proto field). It also can't support the device authorization flow: Google requires client_secret when polling for the device token and the client doesn't send one. Headless Linux and FreeBSD peers only use the device flow, so they can't log in with SSO or use netbird ssh against Google directly. That is the failure reported in the discussion.

Changes:

• Google Workspace page: the standalone section is renamed to "Not Recommended" and now has a warning that points to the Management Setup and the migration guide.
• Legacy standalone Google page: the old warning said the client secret "has been removed" from the auth flow, which is not accurate. Management still sends it and the field is only marked deprecated. The warning now says it is deprecated and will be removed. The page also documents the device flow limitation and fixes a link to an anchor that doesn't exist on that page.
• External to Embedded IdP migration guide: adds a google connector seed example and the /oauth2/callback redirect URI. Dex's Google connector uses the ID token sub as the user ID, the same ID the standalone setup uses, so migrated users keep their accounts.
• Advanced self-hosting guide: the Google entry now says it is not recommended as a standalone IdP.

Validated with npm run lint:mdx and npm run build, and checked that every new in-page anchor is present in the rendered HTML.

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https://claude.ai/code/session_01WxGYofKNYt3aGPnbg6RQsX

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Generated by Claude Code

Summary by CodeRabbit

• Documentation
  • Marked standalone Google Workspace authentication as not recommended and documented its client secret delivery and device authorization limitations.
  • Added guidance for migrating to Google through the embedded identity provider, including setup details that preserve existing accounts.
  • Clarified that existing users can continue signing in with Google accounts.

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• src/pages/selfhosted/selfhosted-guide.mdx

📝 Walkthrough

Walkthrough

The documentation now labels standalone Google Workspace authentication as not recommended and describes its limitations. It also adds Google-specific connector configuration guidance for migration to the embedded identity provider.

Changes

Google Workspace identity provider guidance

Layer / File(s)	Summary
Standalone provider status and limitations src/pages/selfhosted/identity-providers/managed/google-workspace.mdx, src/pages/selfhosted/identity-providers/managed/advanced/google-workspace.mdx, src/pages/selfhosted/selfhosted-guide.mdx	The pages describe standalone authentication as not recommended, document client-secret delivery and device authorization limitations, and identify alternatives.
Google connector migration setup src/pages/selfhosted/migration/external-to-embedded-idp.mdx	The migration guide documents the Google connector configuration, account ID relationship, and required OAuth callback redirect URI.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Merge Risk: 🔵 Low · up to b2a97

Google users following the guide may choose standalone setup despite its documented limitations. The guide needs a small, provider-specific instruction update; the risk is bounded.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the primary change: marking direct Google identity-provider setup as not recommended for self-hosted deployments.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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_{A rabbit reads the Google guide,
Then hops where embedded logins reside.
“Use keys,” it notes, “when screens are away,”
And checks the callback path today.
With carrots packed, it bounds along,
Glad clearer steps now guide the song.}

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/pages/selfhosted/selfhosted-guide.mdx:
- Line 152: Update Step 3 and its note in the self-hosted guide to direct Google
users to Management Setup (Recommended), while keeping the standalone setup
instruction for all other listed providers.

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📒 Files selected for processing (4)

• src/pages/selfhosted/identity-providers/managed/advanced/google-workspace.mdx
• src/pages/selfhosted/identity-providers/managed/google-workspace.mdx
• src/pages/selfhosted/migration/external-to-embedded-idp.mdx
• src/pages/selfhosted/selfhosted-guide.mdx

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