A status badge on the GitHub logo’s corner, a details panel and a contextual incident pill, fed by githubstatus.com. See the Features section of the root README.md for what users see.
relevance.js — pure rules: dot state (worst of indicator, incident impacts and components; unknown after 15 minutes), route to components, wide incidents, notice and dismissal. Unit-tested.content.js, content.css — anchors (logo link, header search control, found by layout: the outermost wrapper in a row that has a gap), the dot overlaid on the logo by CSS anchor positioning with a ring read from the header’s background, native popover panel, pill, SPA re-scan. No fallback container: a missing anchor means nothing is inserted until the next scan.../../background/github-status.js — the one shared, cached, anonymous summary.json fetch (message GITHUB_STATUS_GET).