Remove ci_runner_limits feature flag

app/models/ci/runner_namespace.rb

@@ -7,7 +7,6 @@ module Ci
     self.limit_name = 'ci_registered_group_runners'
     self.limit_scope = :group
     self.limit_relation = :recent_runners
-    self.limit_feature_flag = :ci_runner_limits
     self.limit_feature_flag_for_override = :ci_runner_limits_override
 
     belongs_to :runner, inverse_of: :runner_namespaces

app/models/ci/runner_project.rb

@@ -7,7 +7,6 @@ module Ci
     self.limit_name = 'ci_registered_project_runners'
     self.limit_scope = :project
     self.limit_relation = :recent_runners
-    self.limit_feature_flag = :ci_runner_limits
     self.limit_feature_flag_for_override = :ci_runner_limits_override
 
     belongs_to :runner, inverse_of: :runner_projects

config/feature_flags/development/ci_runner_limits.yml

----
-name: ci_runner_limits
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/60157
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/329438
-milestone: '13.12'
-type: development
-group: group::runner
-default_enabled: false

doc/administration/instance_limits.md

@@ -534,7 +534,11 @@ Plan.default.actual_limits.update!(pages_file_entries: 100)
 
 ### Number of registered runners per scope
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/321368) in GitLab 13.12.
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/321368) in GitLab 13.12. Disabled by default.
+> - Enabled on GitLab.com in GitLab 14.3.
+> - Enabled on self-managed in GitLab 14.4.
+> - Feature flag `ci_runner_limits` removed in GitLab 14.4. You can still use `ci_runner_limits_override`
+    to remove limits for a given scope.
 
 The total number of registered runners is limited at the group and project levels. Each time a new runner is registered,
 GitLab checks these limits against runners that have been active in the last 3 months.