The page is index.html at the site root; view it with your browser's View Source. It only renders the JSON from /api/status: it never makes its own health calls. States: OK only from a fresh 2xx JSON reading; UNAVAILABLE on timeout/error/non-2xx/non-JSON/self-reported unhealthy, or when the checker can't be reached at all; STALE when the reading on screen is older than 90 s. Polls every 30 s, re-renders the age every 5 s.