Merge branch 'mg-add-worker-ff-type' into 'master'

Add new feature flag type called `worker`

Closes gitlab-com/gl-infra/scalability#2345

See merge request !120590



Merged-by: Gregorius Marco <gmarco@gitlab.com>
Approved-by: Gosia Ksionek <mksionek@gitlab.com>
Reviewed-by: Gosia Ksionek <mksionek@gitlab.com>

doc/development/feature_flags/index.md

@@ -144,6 +144,13 @@ An `experiment` feature flag should conform to the same standards as a `developm
 although the interface has some differences. An experiment feature flag should have a rollout issue,
 created using the [Experiment Tracking template](https://gitlab.com/gitlab-org/gitlab/-/blob/master/.gitlab/issue_templates/Experiment%20Rollout.md). More information can be found in the [experiment guide](../experiment_guide/index.md).
 
+### `worker` type
+
+`worker` feature flags are used for controlling Sidekiq workers behavior, such as deferring Sidekiq jobs.
+
+`worker` feature flags likely do not have any YAML definition as the name could be dynamically generated using
+the worker name itself, e.g. `defer_sidekiq_jobs:AuthorizedProjectsWorker`.
+
 ## Feature flag definition and validation
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/229161) in GitLab 13.3.

lib/feature/shared.rb

@@ -54,6 +54,17 @@ module Shared
         example: <<-EOS
           experiment(:my_experiment, project: project, actor: current_user) { ...variant code... }
         EOS
+      },
+      worker: {
+        description: "Feature flags for controlling Sidekiq workers behavior (e.g. deferring jobs)",
+        optional: true,
+        rollout_issue: false,
+        ee_only: false,
+        default_enabled: false,
+        example: '<<-EOS
+          Feature.enabled?(:"defer_sidekiq_jobs:AuthorizedProjectsWorker", type: :worker,
+                            default_enabled_if_undefined: false)
+        EOS'
       }
     }.freeze