system.rss.yml

AggregatorRenderingTest::testFeedPage in drupal/core/modules/aggregator/lib/Drupal/aggregator/Tests/AggregatorRenderingTest.php

Create a feed and check that feed's page.

aggregator_page_rss in drupal/core/modules/aggregator/aggregator.pages.inc

Page callback: Generates an RSS 0.92 feed of aggregator items or categories.

node_feed in drupal/core/modules/node/node.module

Page callback: Generates and prints an RSS feed.

system_rss_feeds_settings in drupal/core/modules/system/system.admin.inc

Form builder; Configure how the site handles RSS feeds.

channel:
  description: ''
items:
  limit: '10'
  view_mode: fulltext