Agent - 4.4.0
3 min
[4.4.0] - December 18, 2025
This release adds support for Holdouts, allowing you to measure the incremental impact of feature flags and experiments by holding back a percentage of users from seeing any changes.
New Features
- Holdouts Support (#452): Agent now fully supports Optimizely's Holdouts feature for measuring incremental impact of flags and experiments. Features include:
- Full holdouts evaluation through go-sdk v2.3.0
- Support for global (project-level) holdouts
- Holdouts evaluated before experiments and rollouts in decision flow
- Holdout decisions return enabled: false, variationKey: "off", and ruleKey containing the holdout identifier
- Forced decisions correctly override holdout bucketing
- Zero Agent code changes required - all holdout logic handled by go-sdk
- Comprehensive acceptance test coverage with real project datafile
This enables accurate measurement of feature impact by comparing users held out from experiments against those receiving variations.
- CMAB Acceptance Tests (#451): Added comprehensive acceptance tests for Contextual Multi-Armed Bandit (CMAB) functionality to ensure reliable AI-powered experimentation
Changed
- Updated to go-sdk v2.3.0 with holdouts support and CMAB improvements
- Updated CMAB API migration to use CmabConfig.PredictionEndpointTemplate field
Fixed
- Fixed Prisma security scanning issues (#450)