Merge branch 'clarify-ops-feature-flag' into 'master'

Clarify status ops feature flag issue

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/175390



Merged-by: Arturo Herrero <arturo.herrero@gmail.com>
Approved-by: Dmitry Gruzd <dgruzd@gitlab.com>
Reviewed-by: Dmitry Gruzd <dgruzd@gitlab.com>

config/feature_flags/ops/sidekiq_concurrency_limit_middleware.yml

 ---
 name: sidekiq_concurrency_limit_middleware
 introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/139851
+# We closed the rollout issue because the feature flag is globally enabled,
+# but we want to keep it in the codebase as a safety net for the middleware.
 rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/435391
 milestone: '16.9'
 type: ops