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
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import datetime
import itertools
import logging
import multiprocessing
import os
import sched
import signal
import sys
import threading
import time
from collections import defaultdict
from contextlib import redirect_stderr, redirect_stdout, suppress
from datetime import timedelta
from multiprocessing.connection import Connection as MultiprocessingConnection
from typing import Any, Callable, DefaultDict, Dict, Iterable, List, Optional, Set, Tuple
from setproctitle import setproctitle
from sqlalchemy import and_, func, not_, or_
from sqlalchemy.exc import OperationalError
from sqlalchemy.orm import load_only, selectinload
from sqlalchemy.orm.session import Session, make_transient
from airflow import models, settings