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@jaeopt jaeopt commented Feb 9, 2026

Summary

Excludes CMAB experiments from UserProfileService (UPS) logic to prevent sticky bucketing that contradicts CMAB's dynamic decision-making nature. UPS maintains decisions across the experiment lifetime without considering TTL or user attributes, which prevents CMAB from properly evaluating contextual signals on each decision request.

Changes

  • Modified decision service to exclude CMAB experiments from UPS lookup operations
  • Modified decision service to exclude CMAB experiments from UPS save operations
  • Added decision reasons when UPS is skipped for CMAB experiments

Jira Ticket

FSSDK-12262


🤖 Generated with Claude Code

jaeopt and others added 3 commits February 5, 2026 13:09
- Skip UPS lookup for CMAB experiments to ensure dynamic decisions
- Skip UPS save for CMAB experiments to prevent sticky bucketing
- Add decision reason explaining UPS exclusion for CMAB
- Add test to verify UPS is not used for CMAB experiments

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