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@jaeopt jaeopt commented Feb 10, 2026

Summary

CMAB experiments should not use UserProfileService (UPS) for sticky bucketing. UPS maintains decisions across the experiment lifetime without considering TTL or user attributes, which contradicts CMAB's dynamic decision-making nature. This change explicitly excludes CMAB from UPS logic.

Changes

  • Skip UPS lookup for CMAB experiments in the decision service
  • Skip saving CMAB decisions to UPS after variation assignment
  • Add decision reason logging when UPS is excluded for CMAB experiments
  • Add unit tests verifying CMAB UPS exclusion behavior

Jira Ticket

FSSDK-12262

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