Log WaitableWorker inline job executions

Sidekiq does not log these executions as they are not performed async.

Changelog: other

app/workers/concerns/waitable_worker.rb

@@ -32,7 +32,9 @@ module WaitableWorker
       failed = []
 
       args_list.each do |args|
-        new.perform(*args)
+        worker = new
+        Gitlab::AppJsonLogger.info(worker.structured_payload(message: 'running inline'))
+        worker.perform(*args)
       rescue StandardError
         failed << args
       end

spec/workers/concerns/waitable_worker_spec.rb

@@ -38,6 +38,12 @@ RSpec.describe WaitableWorker do
     it 'inlines workloads <= 3 jobs' do
       args_list = [[1], [2], [3]]
       expect(worker).to receive(:bulk_perform_inline).with(args_list).and_call_original
+      expect(Gitlab::AppJsonLogger).to(
+        receive(:info).with(a_hash_including('message' => 'running inline',
+                                             'class' => 'Gitlab::Foo::Bar::DummyWorker',
+                                             'job_status' => 'running',
+                                             'queue' => 'foo_bar_dummy'))
+                      .exactly(3).times)
 
       worker.bulk_perform_and_wait(args_list)