We have flaky scheduler test:


https://github.com/apache/airflow/pull/11659/checks?check_run_id=1279791496#step:6:527


_______________ TestSchedulerJob.test_scheduler_task_start_date ________________

self = <tests.jobs.test_scheduler_job.TestSchedulerJob testMethod=test_scheduler_task_start_date>

    def test_scheduler_task_start_date(self):
        """
        Test that the scheduler respects task start dates that are different from DAG start dates
        """
    
        dagbag = DagBag(dag_folder=os.path.join(settings.DAGS_FOLDER, "no_dags.py"), include_examples=False)
        dag_id = 'test_task_start_date_scheduling'
        dag = self.dagbag.get_dag(dag_id)
        dag.is_paused_upon_creation = False
        dagbag.bag_dag(dag=dag, root_dag=dag)
    
        # Deactivate other dags in this file so the scheduler doesn't waste time processing them
        other_dag = self.dagbag.get_dag('test_start_date_scheduling')
        other_dag.is_paused_upon_creation = True
        dagbag.bag_dag(dag=other_dag, root_dag=other_dag)
    
        dagbag.sync_to_db()
    
        scheduler = SchedulerJob(executor=self.null_exec,
                                 subdir=dag.fileloc,
                                 num_runs=2)
        scheduler.run()
    
        session = settings.Session()
        tiq = session.query(TaskInstance).filter(TaskInstance.dag_id == dag_id)
        ti1s = tiq.filter(TaskInstance.task_id == 'dummy1').all()
        ti2s = tiq.filter(TaskInstance.task_id == 'dummy2').all()
        self.assertEqual(len(ti1s), 0)
>       self.assertEqual(len(ti2s), 2)
E       AssertionError: 1 != 2
tests/cli/commands/test_jobs_command.py
clear_db_jobs()
    def tearDown(self) -> None:
        clear_db_jobs()
    def test_should_report_success_for_one_working_scheduler(self):
        with create_session() as session:
            job = SchedulerJob()
            job.state = State.RUNNING
            session.add(job)
            session.commit()
            job.heartbeat()
        with contextlib.redirect_stdout(io.StringIO()) as temp_stdout:
            jobs_command.check(self.parser.parse_args(['jobs', 'check', '--job-type', 'SchedulerJob']))
        self.assertIn("Found one alive job.", temp_stdout.getvalue())
    def test_should_report_success_for_one_working_scheduler_with_hostname(self):
        with create_session() as session:
            job = SchedulerJob()
            job.state = State.RUNNING
            job.hostname = 'HOSTNAME'
            session.add(job)
            session.commit()
            job.heartbeat()
        with contextlib.redirect_stdout(io.StringIO()) as temp_stdout:
            jobs_command.check(
                self.parser.parse_args(
                    ['jobs', 'check', '--job-type', 'SchedulerJob', '--hostname', 'HOSTNAME']
                )
            )
        self.assertIn("Found one alive job.", temp_stdout.getvalue())
    def test_should_report_success_for_ha_schedulers(self):