https://github.com/apache/airflow/pull/12139 added some new params to the scheduler -- we have "cursory" docs for them in the comments in the config file, but we should have a more details docs in the scheduler.rst page.
airflow/jobs/scheduler_job.py
self.log.info("Starting the scheduler")
        
        pickle_dags = self.do_pickle and self.executor_class not in UNPICKLEABLE_EXECUTORS
        self.log.info("Processing each file at most %s times", self.num_times_parse_dags)
        
        
        async_mode = not self.using_sqlite
        processor_timeout_seconds: int = conf.getint('core', 'dag_file_processor_timeout')
        processor_timeout = timedelta(seconds=processor_timeout_seconds)
        self.processor_agent = DagFileProcessorAgent(
            dag_directory=self.subdir,
            max_runs=self.num_times_parse_dags,
            processor_factory=type(self)._create_dag_file_processor,
            processor_timeout=processor_timeout,
            dag_ids=[],