## Summary Roll out [the feature](https://gitlab.com/gitlab-org/gitlab/-/issues/285853) currently behind the `ci_parallel_matrix_value_alias` feature flag. Introduced by https://gitlab.com/gitlab-org/gitlab/-/merge_requests/258125. - DRI: @furkanayhan - Team Slack channel: `#g_pipeline-authoring` > [!note] > Process and guidance live in the docs — this issue is just the commands and a place to track the rollout. > "Rolling out" means incrementally enabling the flag on GitLab.com to validate stability — it is not the same as releasing the feature, which happens when the flag is removed. > [Feature flag controls](https://docs.gitlab.com/development/feature_flags/controls/) · [Feature flag lifecycle](https://handbook.gitlab.com/handbook/product-development/how-we-work/product-development-flow/feature-flag-lifecycle/#feature-flag-lifecycle) ## What could go wrong? - The flag is checked with the project as the actor, during CI config validation. - When enabled, `parallel:matrix` values can be `{ value:, alias: }` hashes, and the alias is used in the generated job names. Bugs here could make valid configs fail, or make `needs:parallel:matrix` match the wrong job. - Configs without aliases should not be affected. Note that the `needs:parallel:matrix` matching change in the normalizer is not behind the flag. - Disabling the flag after users adopt aliases makes their configs invalid (`matrix value aliases are not supported`). ## Events - [Exceptions with ci_parallel_matrix_value_alias:1](https://log.gprd.gitlab.net/app/discover#/?_g=(time:(from:now-1d,to:now))&_a=(index:'7092c4e2-4eb5-46f2-8305-a7da2edad090',query:(language:kuery,query:'json.exception.feature_flag_states.keyword:%22ci_parallel_matrix_value_alias:1%22'),columns:!(json.exception.class,json.exception.message,json.extra.workflow_id,json.meta.caller_id),sort:!(!(json.time,desc)))) - [Events with ci_parallel_matrix_value_alias:1](https://log.gprd.gitlab.net/app/discover#/?_g=(time:(from:now-1d,to:now))&_a=(index:'7092c4e2-4eb5-46f2-8305-a7da2edad090',query:(language:kuery,query:'json.feature_flag_states:%22ci_parallel_matrix_value_alias:1%22'),columns:!(json.meta.caller_id,json.feature_flag_states),sort:!(!(json.time,desc)))) - [Error rate and other graphs by modifying the examples in the Visualization Library](https://log.gprd.gitlab.net/app/visualize#/?_g=h@358d019&s=FF%20Observability) Feature Flag events are only logged by default for feature flags marked for the current or future milestones. To enable while the feature flag is active, see https://docs.gitlab.com/development/feature_flags/#logging ## Rollout Run all production `/chatops` in [`#production`](https://gitlab.slack.com/archives/C101F3796) and cross-post the results to `#g_pipeline-authoring`. Background: [incremental rollout process](https://docs.gitlab.com/development/feature_flags/controls/#process), [feature actors](https://docs.gitlab.com/development/feature_flags/#feature-actors). **Non-production** ``` /chatops gitlab run feature set ci_parallel_matrix_value_alias 50 --actors --dev --pre --staging --staging-ref /chatops gitlab run feature set ci_parallel_matrix_value_alias true --dev --pre --staging --staging-ref ``` **Production** — percentage rollout (wait ≥15 min between steps, watch dashboards): ``` /chatops gitlab run feature set ci_parallel_matrix_value_alias <percentage> --actors ``` Or target specific actors instead: ``` /chatops gitlab run feature set --project=gitlab-org/gitlab,gitlab-org/gitlab-foss ci_parallel_matrix_value_alias true /chatops gitlab run feature set --group=gitlab-org,gitlab-com ci_parallel_matrix_value_alias true ``` ## Before global rollout Confirm the relevant gotchas before going to 100% — see [enabling a feature for GitLab.com](https://docs.gitlab.com/development/feature_flags/controls/#enabling-a-feature-for-gitlabcom): - [ ] [Docs + version history](https://docs.gitlab.com/development/documentation/feature_flags/) updated - [ ] [Breaking changes](https://docs.gitlab.com/development/documentation/release_notes/#deprecations-removals-and-breaking-changes) announced, if any - [ ] [Change management issue](https://handbook.gitlab.com/handbook/engineering/infrastructure-platforms/change-management/#feature-flags-and-the-change-management-process) opened, if required ## Cleanup Remove the flag once [deemed stable](https://handbook.gitlab.com/handbook/product-development/how-we-work/product-development-flow/feature-flag-lifecycle/#feature-flag-lifecycle) — see [cleaning up](https://docs.gitlab.com/development/feature_flags/controls/#cleaning-up). Remove the flag and its YAML definition from the codebase, then: ``` /chatops gitlab run release check <merge-request-url> <milestone> /chatops gitlab run feature delete ci_parallel_matrix_value_alias --dev --pre --staging --staging-ref --production ``` ## Rollback ``` /chatops gitlab run feature set ci_parallel_matrix_value_alias false # production /chatops gitlab run feature set ci_parallel_matrix_value_alias false --dev --pre --staging --staging-ref # non-production /chatops gitlab run feature delete ci_parallel_matrix_value_alias --dev --pre --staging --staging-ref --production # remove entirely ```