docs(datadog): disclaim that the plugin cannot work until DCR is unlocked

[devin-ai-integration]

Summary

@sentry/junior-datadog can't actually connect today: Datadog's hosted MCP server (mcp.datadoghq.com) requires OAuth 2.1 + PKCE, but does not expose Dynamic Client Registration (DCR, RFC 7591) for third-party clients like Junior. Without DCR (or an equivalent registration path), Junior has no way to register an OAuth client, so the auth handshake fails at connect time and every Datadog tool call fails.

Rather than yank the plugin, per David's call we're keeping it in-tree and slapping a big disclaimer on it so nobody deploys it expecting it to work. When Datadog opens up DCR, we flip the disclaimer off.

Changes:

• packages/junior-datadog/README.md: adds a > [!WARNING] callout at the top explaining the DCR lockdown and that the package is not production-ready.
• packages/docs/src/content/docs/extend/datadog-plugin.md: adds the same disclaimer as a Starlight :::danger aside at the top of the tutorial page so it's visible on junior.sentry.dev.
• Monorepo README.md: marks @sentry/junior-datadog as non-functional in the package table, linking to the package README.

No plugin, manifest, or runtime code is touched — this is docs/README only.

Review & Testing Checklist for Human

• Read the two disclaimers (package README and docs page) and confirm the wording is how you want to communicate the DCR issue externally. I called it "Datadog has DCR locked down" — swap if you want softer/stronger language.
• Confirm you're OK pointing external readers at RFC 7591 as the DCR reference. If there's a Datadog-side issue/tracking link you'd rather cite, drop that in.
• Decide whether the monorepo README.md package-table should also drop the Datadog row entirely instead of marking it non-functional. I left it in since the package is still shipped.

Notes

• Starlight supports :::danger asides out of the box, but nothing else in packages/docs currently uses asides, so the datadog-plugin.md page is the first to render one. Confirmed via pnpm docs:check that the build succeeds and produces /extend/datadog-plugin/.
• pnpm lint passes. No typecheck/test changes since this is docs-only.
• Intentionally did not remove @sentry/junior-datadog from apps/example/plugin-packages.ts, .craft.yml, or the release workflow. Happy to do that as a follow-up if you'd rather stop publishing releases until it works.

Link to Devin session: https://app.devin.ai/sessions/b41bfa31002d4335adca8cdb0d7cdf4d
Requested by: @dcramer

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Project	Deployment	Actions	Updated (UTC)
junior-docs	Ready	Preview, Comment	Apr 17, 2026 10:51pm

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.