V16 CMS: Removal of MaxQueryStringLength

[iOvergaard]

📋 Description

This pull request updates the documentation for runtime and maximum upload size settings in Umbraco CMS to clarify the behavior and configuration of MaxRequestLength and related settings, especially when hosting with Kestrel. It removes references to MaxQueryStringLength from Kestrel configuration examples and adds guidance on where to find current configuration values in the Backoffice UI.

Documentation improvements for runtime and upload size settings:

• Clarified that MaxRequestLength only affects setups hosted with Kestrel, and added a link to the maximumuploadsizesettings.md article for more information in runtimesettings.md.
• Removed MaxQueryStringLength from Kestrel configuration examples and related documentation in both maximumuploadsizesettings.md and runtimesettings.md.
• Added instructions and a screenshot showing how to check the current maximum upload size configuration in the Backoffice System Information section.

📎 Related Issues (if applicable)

Fixes AB#52338

✅ Contributor Checklist

I've followed the Umbraco Documentation Style Guide and can confirm that:

• Code blocks are correctly formatted.
• Sentences are short and clear (preferably under 25 words).
• Passive voice and first-person language (“we”, “I”) are avoided.
• Relevant pages are linked.
• All links work and point to the correct resources.
• Screenshots or diagrams are included if useful.
• Any code examples or instructions have been tested.
• Typos, broken links, and broken images are fixed.

Product & Version (if relevant)

V16

Deadline (if relevant)

ASAP

📚 Helpful Resources

• 🧾 Umbraco Contribution Guidelines
• ✍️ Umbraco Documentation Style Guide

[eshanrnh]

Thanks for the PR, @iOvergaard 🙌 The PR looks great.