Feature Flag Segments
A feature flag segment is a rule that allows some users of a given segment access to the feature.
A feature flag segment is defined by a segment, a feature flag, a rollout attribute and a rollout percentage.
Here the segment defines the group that can use the feature. The feature flag determines the feature and the environment. The rollout percentage fixes the percentage of this group that can use the feature and the rollout attribute is used to assign consistently the users with access to the feature.
For more information about rollout attributes check stickiness-attributes.