Add patch method for enabling and disabling error tracking setting

lib/api/error_tracking.rb

@@ -23,6 +23,29 @@ module API
 
         present setting, with: Entities::ErrorTracking::ProjectSetting
       end
+
+      desc 'Enable/Disable error tracking settings for the project' do
+        detail 'This feature was introduced in GitLab 12.8.'
+        success Entities::ErrorTracking::ProjectSetting
+      end
+      params do
+        requires :active, type: Boolean, desc: 'Specifying whether to enable or disable error tracking settings'
+      end
+
+      patch ':id/error_tracking/settings/' do
+        authorize! :admin_operations, user_project
+
+        setting = user_project.error_tracking_setting
+
+        not_found!('Error Tracking Setting') unless setting
+
+        update_params = {
+          error_tracking_setting_attributes: { enabled: params[:active] }
+        }
+        result = ::Projects::Operations::UpdateService.new(user_project, current_user, update_params).execute
+
+        present result, with: Entities::ErrorTracking::ProjectSetting
+      end
     end
   end
 end