DOC-2042 RPCN changes for Serverless

[micheleRP]

Description

This pull request updates the documentation to reflect an increase in the usage limits for Serverless clusters in Redpanda Cloud, specifically for Redpanda Connect pipelines and MCP servers. The changes ensure that users are informed about the new, higher limits and include an entry in the "What's New" section to announce this update.

• Increased the documented limit of Redpanda Connect pipelines for Serverless clusters from 10 to 100 in both the quickstart and usage limits documentation (connect-quickstart.adoc, serverless.adoc). [1] [2]
• Increased the documented limit of MCP servers for Serverless clusters from 10 to 100 in the usage limits documentation (serverless.adoc).
• Added a "What's New" entry for April 2026, announcing the increased limits for Redpanda Connect pipelines and MCP servers in Serverless clusters (whats-new-cloud.adoc).

Resolves https://redpandadata.atlassian.net/browse/DOC-2042
Review deadline: March 31

Page previews

What's New
Serverless usage limits
Redpanda Connect pipeline limit

Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)

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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request updates documentation capacity limits for Redpanda Cloud Serverless clusters. The changes increase the maximum number of supported Redpanda Connect pipelines from 10 to 100 and MCP servers from 10 to 100 across three documentation files. Additionally, a new "April 2026" entry is added to the "What's New in Redpanda Cloud" page documenting these limit increases with a reference to the Serverless usage limits documentation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• DOC-1350 Document feature Serverless on GCP #432: Modifies the same Serverless usage limits documentation file with structural updates to limit entries
• DOC-2045: Add missing limits to Serverless usage limits #518: Previously established these same limits at 10, which are now being increased to 100
• DOC-1724 fix typo #429: Updates Serverless documentation for Redpanda Connect feature area with removal of beta notation

Suggested reviewers

• Feediver1
• towfiqa
• david-yu

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'DOC-2042 RPCN changes for Serverless' directly references the Jira issue and clearly summarizes the main change: documentation updates for Serverless cluster usage limits.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The PR description is well-structured, comprehensive, and mostly follows the template with clear details about changes, documentation updates, and page previews.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch DOC-2042-Document-feature-RPCN-Changes-for-Serverless-April-1-LIVE

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[JakeSCahill]

Approved with a comment.

[JakeSCahill]

Should we mention the MCP limit in the MCP overview doc?

[towfiqa]

@nicolaferraro did we change MCP servers to 100? I thought we only changed RPCN pipelines limit?