John Parent
--- a/app/services/ci/stuck_builds/drop_preparing_service.rb 0 → 100644
+++ b/app/services/ci/stuck_builds/drop_preparing_service.rb 0 → 100644
+        Gitlab::AppLogger.info "#{self.class}: Cleaning preparing timed-out builds"
+
+        drop(
+          preparing_builds(BUILD_PREPRARING_OUTDATED_TIMEOUT.ago),
+          failure_reason: :stuck_or_timeout_failure
+        )
+
+        drop_stuck(
+          preparing_builds(BUILD_PREPRARING_STUCK_TIMEOUT.ago),
+          failure_reason: :stuck_or_timeout_failure
+        )
+      end
+
+      private
+
+      # rubocop: disable CodeReuse/ActiveRecord
--- a/app/workers/ci/build_prerequisite_worker.rb 0 → 100644
+++ b/app/workers/ci/build_prerequisite_worker.rb 0 → 100644
+# frozen_string_literal: true
+
+module Ci
+  class BuildPrerequisiteWorker # rubocop:disable Scalability/IdempotentWorker
--- a/app/workers/ci/build_prerequisite_worker.rb 0 → 100644
+++ b/app/workers/ci/build_prerequisite_worker.rb 0 → 100644
+# frozen_string_literal: true
+
+module Ci
+  class BuildPrerequisiteWorker # rubocop:disable Scalability/IdempotentWorker
+    include ApplicationWorker
+
+    data_consistency :always # rubocop:disable SidekiqLoadBalancing/WorkerDataConsistency
--- a/lib/api/integrations/admission_controller/response.rb 0 → 100644
+++ b/lib/api/integrations/admission_controller/response.rb 0 → 100644
+                requires :admission, type: String, values: [:accepted, :rejected], desc: 'Job admission status'
+                optional :reason, type: String, desc: 'Reason for admission status'
+                optional :accepted, type: Array, desc: 'Admission acceptance requirements' do
+                  optional :tags, type: Array, desc: 'Tag modifications for job selection on runners' do
+                    optional :additions, type: Array, desc: 'Tags to be added to current job tag list'
+                    optional :removals, type: Array, desc: 'Tags to be removed from current job tag list'
+                    at_least_one_of :additions, :removals
+                  end
+                  optional :runners, type: Array, desc: 'Runner ids over which to scope runner selection of job' do
+                    optional :allowed_ids, type: Array, desc: 'The only runner ids for which a job is able to match'
+                    optional :denied_ids, type: Array, desc: 'Runner ids for which the job cannot match'
+                    at_least_one_of :allowed_ids, :denied_ids
+                  end
+                end
+              end
+              post do
--- a/lib/gitlab/ci/matching/build_matcher.rb
+++ b/lib/gitlab/ci/matching/build_matcher.rb
          tag_list
          build_ids
          project
+          runner_allowlist
--- a/app/models/ci/build.rb
+++ b/app/models/ci/build.rb
+    def admission_controller_enabled_present?
+      # TODO (john.parent): bool below should be check for
+      # configured admission controller webhook when that
+      # change is introduced
+      Feature.enabled?(:admission_controller_hook) && false
+    end
+
+    def admission_failed!(reason: :unknown_admission_failure)
+      unless reason == :unknown_admission_failure
+        update_admission_reason(reason, :rejection)
+      end
+      # TODO (john.parent@kitware.com): Find better exit code
+      drop_with_exit_code!(:admission_rejected, 1)
+    end
+
+    def admission_accepted!(params: :no_context, reason: :no_reason)