GraphQL: Expose executorName field in CiRunner

Introduce `graphql_ci_runner_executor` FF to signal that the new field
is still subject to changes

app/graphql/types/ci/runner_type.rb

@@ -54,6 +54,10 @@ module Types
             description: "Number of jobs processed by the runner (limited to #{JOB_COUNT_LIMIT}, plus one to indicate that more items exist)."
       field :admin_url, GraphQL::Types::String, null: true,
             description: 'Admin URL of the runner. Only available for administrators.'
+      field :executor_name, GraphQL::Types::String, null: true,
+            description: 'Executor last advertised by the runner.',
+            method: :executor_name,
+            feature_flag: :graphql_ci_runner_executor
 
       def job_count
         # We limit to 1 above the JOB_COUNT_LIMIT to indicate that more items exist after JOB_COUNT_LIMIT

app/models/ci/runner.rb

@@ -441,6 +441,7 @@ module Ci
     private
 
     EXECUTOR_NAME_TO_TYPES = {
+      'unknown' => :unknown,
       'custom' => :custom,
       'shell' => :shell,
       'docker' => :docker,
@@ -454,6 +455,8 @@ module Ci
       'kubernetes' => :kubernetes
     }.freeze
 
+    EXECUTOR_TYPE_TO_NAMES = EXECUTOR_NAME_TO_TYPES.invert.freeze
+
     def cleanup_runner_queue
       Gitlab::Redis::SharedState.with do |redis|
         redis.del(runner_queue_key)

app/presenters/ci/runner_presenter.rb

@@ -11,5 +11,9 @@ module Ci
 
     delegator_override :locked
     alias_method :locked, :locked?
+
+    def executor_name
+      Ci::Runner::EXECUTOR_TYPE_TO_NAMES[executor_type&.to_sym]
+    end
   end
 end

config/feature_flags/development/graphql_ci_runner_executor.yml

+---
+name: graphql_ci_runner_executor
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/76534
+rollout_issue_url:
+milestone: '14.7'
+type: development
+group: group::runner
+default_enabled: false

doc/api/graphql/reference/index.md

@@ -8812,6 +8812,7 @@ Represents the total number of issues and their weights for a particular day.
 | <a id="cirunneradminurl"></a>`adminUrl` | [`String`](#string) | Admin URL of the runner. Only available for administrators. |
 | <a id="cirunnercontactedat"></a>`contactedAt` | [`Time`](#time) | Last contact from the runner. |
 | <a id="cirunnerdescription"></a>`description` | [`String`](#string) | Description of the runner. |
+| <a id="cirunnerexecutorname"></a>`executorName` | [`String`](#string) | Executor last advertised by the runner. Available only when feature flag `graphql_ci_runner_executor` is enabled. This flag is disabled by default, because the feature is experimental and is subject to change without notice. |
 | <a id="cirunnerid"></a>`id` | [`CiRunnerID!`](#cirunnerid) | ID of the runner. |
 | <a id="cirunneripaddress"></a>`ipAddress` | [`String`](#string) | IP address of the runner. |
 | <a id="cirunnerjobcount"></a>`jobCount` | [`Int`](#int) | Number of jobs processed by the runner (limited to 1000, plus one to indicate that more items exist). |

spec/graphql/types/ci/runner_type_spec.rb

@@ -11,7 +11,7 @@ RSpec.describe GitlabSchema.types['CiRunner'] do
     expected_fields = %w[
       id description contacted_at maximum_timeout access_level active status
       version short_sha revision locked run_untagged ip_address runner_type tag_list
-      project_count job_count admin_url user_permissions
+      project_count job_count admin_url user_permissions executor_name
     ]
 
     expect(described_class).to include_graphql_fields(*expected_fields)

spec/requests/api/graphql/ci/runner_spec.rb

@@ -11,7 +11,7 @@ RSpec.describe 'Query.runner(id)' do
   let_it_be(:active_instance_runner) do
     create(:ci_runner, :instance, description: 'Runner 1', contacted_at: 2.hours.ago,
            active: true, version: 'adfe156', revision: 'a', locked: true, ip_address: '127.0.0.1', maximum_timeout: 600,
-           access_level: 0, tag_list: %w[tag1 tag2], run_untagged: true)
+           access_level: 0, tag_list: %w[tag1 tag2], run_untagged: true, executor_type: :custom)
   end
 
   let_it_be(:inactive_instance_runner) do
@@ -22,7 +22,7 @@ RSpec.describe 'Query.runner(id)' do
   let_it_be(:active_group_runner) do
     create(:ci_runner, :group, groups: [group], description: 'Group runner 1', contacted_at: 2.hours.ago,
            active: true, version: 'adfe156', revision: 'a', locked: true, ip_address: '127.0.0.1', maximum_timeout: 600,
-           access_level: 0, tag_list: %w[tag1 tag2], run_untagged: true)
+           access_level: 0, tag_list: %w[tag1 tag2], run_untagged: true, executor_type: :shell)
   end
 
   def get_runner(id)
@@ -69,6 +69,7 @@ RSpec.describe 'Query.runner(id)' do
         'runUntagged' => runner.run_untagged,
         'ipAddress' => runner.ip_address,
         'runnerType' => runner.instance_type? ? 'INSTANCE_TYPE' : 'PROJECT_TYPE',
+        'executorName' => runner.executor_type&.dasherize,
         'jobCount' => 0,
         'projectCount' => nil,
         'adminUrl' => "http://localhost/admin/runners/#{runner.id}",