Alias user_email_lookup_limit to search_rate_limit

See https://gitlab.com/gitlab-org/gitlab/-/merge_requests/83213

Changelog: changed

app/controllers/admin/application_settings_controller.rb

@@ -202,7 +202,7 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
     Gitlab::QueryLimiting.disable!('https://gitlab.com/gitlab-org/gitlab/-/issues/29418')
   end
-  def application_setting_params
+  def application_setting_params # rubocop:disable Metrics/AbcSize
     params[:application_setting] ||= {}
     if params[:application_setting].key?(:enabled_oauth_sign_in_sources)
@@ -229,6 +229,10 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
     params.delete(:domain_denylist_raw) if params[:domain_denylist]
     params.delete(:domain_allowlist_raw) if params[:domain_allowlist]
+    if params[:application_setting].key?(:user_email_lookup_limit)
+      params[:application_setting][:search_rate_limit] ||= params[:application_setting][:user_email_lookup_limit]
+    end
+
     params[:application_setting].permit(visible_application_setting_attributes)
   end

doc/api/settings.md

@@ -390,7 +390,7 @@ listed in the descriptions of the relevant settings.
 | `push_event_hooks_limit`                 | integer          | no                                   | Number of changes (branches or tags) in a single push to determine whether webhooks and services fire or not. Webhooks and services aren't submitted if it surpasses that value. |
 | `rate_limiting_response_text`            | string           | no                                   | When rate limiting is enabled via the `throttle_*` settings, send this plain text response when a rate limit is exceeded. 'Retry later' is sent if this is blank. |
 | `raw_blob_request_limit`                 | integer          | no                                   | Max number of requests per minute for each raw path. Default: 300. To disable throttling set to 0.|
-| `user_email_lookup_limit`                | integer          | no                                   | **{warning}** **[Removed](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/80631/)** in GitLab 14.9. Replaced by `search_rate_limit`. Max number of requests per minute for email lookup. Default: 60. To disable throttling set to 0.|
+| `user_email_lookup_limit`                | integer          | no                                   | **{warning}** **[Deprecated](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/80631/)** in GitLab 14.9 will be removed in 15.0. Replaced by `search_rate_limit`. Max number of requests per minute for email lookup. Default: 60. To disable throttling set to 0.|
 | `search_rate_limit`                      | integer          | no                                   | Max number of requests per minute for performing a search while authenticated. Default: 30. To disable throttling set to 0.|
 | `search_rate_limit_unauthenticated`      | integer          | no                                   | Max number of requests per minute for performing a search while unauthenticated. Default: 10. To disable throttling set to 0.|
 | `recaptcha_enabled`                      | boolean          | no                                   | (**If enabled, requires:** `recaptcha_private_key` and `recaptcha_site_key`) Enable reCAPTCHA. |

spec/controllers/admin/application_settings_controller_spec.rb

@@ -291,6 +291,46 @@ RSpec.describe Admin::ApplicationSettingsController, :do_not_mock_admin_mode_set
         end
       end
     end
+
+    describe 'user_email_lookup_limit aliasing' do
+      let(:application_setting) { ApplicationSetting.current }
+      let(:user_email_lookup_limit) { 8675 }
+      let(:search_rate_limit) { 309 }
+
+      context 'when search_rate_limit is specified' do
+        let(:settings_params) do
+          {
+            user_email_lookup_limit: user_email_lookup_limit,
+            search_rate_limit: search_rate_limit
+          }
+        end
+
+        it 'updates search_rate_limit with correct value' do
+          expect(application_setting.search_rate_limit).not_to eq user_email_lookup_limit
+          expect(application_setting.search_rate_limit).not_to eq search_rate_limit
+
+          put :update, params: { application_setting: settings_params }
+
+          expect(application_setting.reload.search_rate_limit).to eq search_rate_limit
+        end
+      end
+
+      context 'when search_rate_limit is not specified' do
+        let(:settings_params) do
+          {
+            user_email_lookup_limit: search_rate_limit
+          }
+        end
+
+        it 'applies user_email_lookup_limit value to search_rate_limit' do
+          expect(application_setting.search_rate_limit).not_to eq search_rate_limit
+
+          put :update, params: { application_setting: settings_params }
+
+          expect(application_setting.reload.search_rate_limit).to eq search_rate_limit
+        end
+      end
+    end
   end
   describe 'PUT #reset_registration_token' do