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Description

Added a "Breaking Changes" section to the server-core documentation to document a user agent parser change in version 0.10.0. The new section explains that the default UA parser switches from a third-party library to a new experimental parser that offers better performance and memory usage, along with migration instructions for users who need the old behavior.

Screenshot of the new Breaking Changes section

Best practice checklist

  • I've considered the best practices on where to put your doc and what to put in your doc
  • I've deleted and redirected old pages to this one, if any
  • I've updated links affected by this change, if any
  • I've updated screenshots affected by this change, if any

Critical Review Items

⚠️ Please verify these details before merging:

  1. Version number accuracy: Confirm that 0.10.0 is the correct version for this breaking change (current codebase shows 0.9.4-rc.2509300136)

  2. Default behavior change: Verify that the experimental parser actually becomes the default in 0.10.0 (current code shows __experimental_ua_parsing_enabled defaults to false)

  3. API examples: Validate that the configuration syntax is correct for each language binding:

    • Node.js: __experimental_ua_parsing_enabled: false
    • Python: __experimental_ua_parsing_enabled=False
    • Java: .setExperimentalUaParsingEnabled(false)
  4. Performance claims: Confirm the "faster and uses significantly less memory" claims are accurate

Context

This change was requested by @xinlili-statsig via Slack (#bot-devin-ai) to document a breaking change in the server-core SDK regarding the default user agent parser.

Link to Devin run: https://app.devin.ai/sessions/49c5711fc461409e92ab520a753c18ca
Requested by: @xinlili-statsig

Questions?

Reach out to Brock or Tore on Slack!

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🚀 Deployed on https://68db4b931f5a9eaecf8668a9--cozy-fox-0defec.netlify.app

@jasonwzm jasonwzm temporarily deployed to pull request September 30, 2025 03:17 Inactive
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