Add gauge for the scheduler itself regardless of which tasks run this time around

lib/roqua/scheduling/scheduler.rb

@@ -11,6 +11,8 @@ class Roqua::Scheduling::Scheduler
           raise ex if Rails.env.test?
         end
       end
+
+      Appsignal.increment_counter("scheduler.completed", 1)
     end
   end
 

spec/roqua/scheduling/scheduler_spec.rb

@@ -86,6 +86,7 @@ describe Roqua::Scheduling::Scheduler do
     end
 
     it 'counts task calls' do
+      expect(Appsignal).to receive(:increment_counter).with('scheduler.completed', 1)
       expect(Appsignal).to receive(:increment_counter).with('scheduler.run_task.completed', 1, task_name: 'hourly')
       subject.ping
     end