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diff --git a/doc/operations/feature_flags.md b/doc/operations/feature_flags.md index c37ab760b89..db12e6eb316 100644 --- a/doc/operations/feature_flags.md +++ b/doc/operations/feature_flags.md @@ -87,12 +87,49 @@ and clicking **{pencil}** (edit). Enables the feature for all users. It uses the [`default`](https://unleash.github.io/docs/activation_strategy#default) Unleash activation strategy. +### Percent Rollout + +> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/43340) in GitLab 13.5. + +Enables the feature for a percentage of page views, with configurable consistency +of behavior. This consistency is also known as stickiness. It uses the +[`flexibleRollout`](https://unleash.github.io/docs/activation_strategy#flexiblerollout) +Unleash activation strategy. + +You can configure the consistency to be based on: + +- **User IDs**: Each user ID has a consistent behavior, ignoring session IDs. +- **Session IDs**: Each session ID has a consistent behavior, ignoring user IDs. +- **Random**: Consistent behavior is not guaranteed. The feature is enabled for the + selected percentage of page views randomly. User IDs and session IDs are ignored. +- **Available ID**: Consistent behavior is attempted based on the status of the user: + - If the user is logged in, make behavior consistent based on user ID. + - If the user is anonymous, make the behavior consistent based on the session ID. + - If there is no user ID or session ID, then the feature is enabled for the selected + percentage of page view randomly. + +For example, set a value of 15% based on **Available ID** to enable the feature for 15% of page views. For +authenticated users this is based on their user ID. For anonymous users with a session ID it would be based on their +session ID instead as they do not have a user ID. Then if no session ID is provided, it falls back to random. + +The rollout percentage can be from 0% to 100%. + +Selecting a consistency based on User IDs functions the same as the [percent of Users](#percent-of-users) rollout. + +CAUTION: **Caution:** +Selecting **Random** provides inconsistent application behavior for individual users. + ### Percent of Users Enables the feature for a percentage of authenticated users. It uses the [`gradualRolloutUserId`](https://unleash.github.io/docs/activation_strategy#gradualrolloutuserid) Unleash activation strategy. +NOTE: **Note:** +[Percent rollout](#percent-rollout) with a consistency based on **User IDs** has the same +behavior. It is recommended to use percent rollout instead of percent of users as +it is more flexible. + For example, set a value of 15% to enable the feature for 15% of authenticated users. The rollout percentage can be from 0% to 100%. |