Release 4.2.0

4.2.0

Nov 13, 2025

New Features

Contextual Multi-Armed Bandit (CMAB)

• Add support for CMAB experiments with new configuration options and cache control (#390, #391, #392, #393, #394).
• To get decision from CMAB rules, decide and related methods must be used.
• For configuration details, see the CMAB configuration documentation.

Holdouts

• Add Holdouts Feature Experimentation feature (#384, #386, #387).