Wrap polling within instrumentation

lib/solid_queue/processes/poller.rb

@@ -45,10 +45,12 @@ def shutdown
       end
 
       def with_polling_volume
-        if SolidQueue.silence_polling? && ActiveRecord::Base.logger
-          ActiveRecord::Base.logger.silence { yield }
-        else
-          yield
+        SolidQueue.instrument(:polling) do
+          if SolidQueue.silence_polling? && ActiveRecord::Base.logger
+            ActiveRecord::Base.logger.silence { yield }
+          else
+            yield
+          end
         end
       end
   end

test/integration/instrumentation_test.rb

@@ -37,6 +37,25 @@ class InstrumentationTest < ActiveSupport::TestCase
     assert_event events.first, "claim", process_id: process.id, job_ids: jobs.map(&:id), claimed_job_ids: jobs.map(&:id), size: 3
   end
 
+  test "polling emits events" do
+    3.times { StoreResultJob.perform_later(42) }
+    process = nil
+    jobs = SolidQueue::Job.last(3)
+
+    events = subscribed("polling.solid_queue") do
+      worker = SolidQueue::Worker.new.tap(&:start)
+
+      wait_while_with_timeout!(3.seconds) { SolidQueue::ReadyExecution.any? }
+      process = SolidQueue::Process.last
+
+      worker.stop
+      wait_for_registered_processes(0, timeout: 3.second)
+    end
+
+    assert_equal 5, events.size
+    assert_event events.last, "polling"
+  end
+
   test "stopping a worker with claimed executions emits release_claimed events" do
     StoreResultJob.perform_later(42, pause: SolidQueue.shutdown_timeout + 100.second)
     process = nil