docs: add string_split processor to Cloud

[JakeSCahill]

Summary

Adds the new string_split processor to Redpanda Cloud documentation. This processor was added in Redpanda Connect 4.86.0.

Changes

✅ Processor page created:

• modules/develop/pages/connect/components/processors/string_split.adoc
• Uses include directive from redpanda-connect component
• Includes page alias for backward compatibility

✅ Navigation updated:

• Added to modules/ROOT/nav.adoc
• Positioned alphabetically after split processor

✅ What's New updated:

• Added entry to April 2026 section
• Listed under "Redpanda Connect updates > Processors"

What is string_split?

The string_split processor splits strings into multiple parts using a delimiter, creating new messages or fields for each part. It's useful for:

• Parsing delimited data
• Breaking single messages into multiple messages
• Creating structured data from flat strings

Testing

• Page builds without errors
• Include directive pulls content from redpanda-connect component
• Navigation link works
• Page alias resolves correctly

Related

• Redpanda Connect 4.86.0 release
• Related to auto-docs: Update RPCN connector docs rp-connect-docs#406

Co-Authored-By: Claude Sonnet 4.5 noreply@anthropic.com

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📝 Walkthrough

Walkthrough

Three documentation files were updated to introduce the string_split processor. A new navigation entry was added to the ROOT navigation file, a new AsciiDoc page was created under the connect components processors section (referencing content from redpanda-connect), and a new subsection was added to the April 2026 release notes in the what's new page listing this processor.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• cloud-docs#447: Adds new processor documentation pages and updates the what's new Cloud page with similar documentation file structure.
• cloud-docs#296: Adds processor documentation pages under the processors section and corresponding navigation entries.

Suggested reviewers

• rockwotj
• Feediver1
• kbatuigas

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'docs: add string_split processor to Cloud' clearly and concisely describes the main change—adding documentation for a new processor to the Cloud docs.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The PR description comprehensively covers all required template sections with clear explanations of changes, testing performed, and context.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-string-split-processor

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[micheleRP]

Review Summary

Small, clean PR. One ordering fix needed.

Findings

1. Nav ordering is wrong (Bug)

string_split is placed after split, but alphabetically it should come after sql_select:

split
sql_insert    ← "sql" < "str"
sql_raw
sql_select
string_split  ← should be here
switch

Currently the diff inserts it between split and sql_insert, which breaks alphabetical ordering. Move it to after sql_select (before switch).

2. Page and include look correct (Positive)

Standard pattern: title, page-alias, include with tag=single-source. Consistent with other processor pages.

3. What's New entry looks good (Positive)

Properly placed in April 2026 section with a clear description and xref link.

Verdict

Move the nav entry from after split to after sql_select, then good to merge.

[micheleRP]

one little fix please!