{
  "metric": "Distinct existing anonymous visitor IDs per canonical page per window, not sessions or ordinary views",
  "window": "30 complete UTC days; UTC is the existing reporting boundary convention. No configured analytics property timezone was found.",
  "source": "Existing first-party AnalyticsEvent store, discovery_pageview_v1, siteId null",
  "taxonomy": {
    "Linux": "excluded",
    "Android": "included separately",
    "ChromeOS": "included separately",
    "Windows": "included",
    "macOS": "included",
    "iOS": "included",
    "Unknown": "excluded; reported in event coverage only"
  },
  "historicalStatus": "Unavailable: legacy UA detector misclassifies Android as Linux and iOS as macOS; raw UA not retained",
  "prospective": "Server request User-Agent classification; existing _dmc_vid cookie only; no fingerprinting. Cookie resets create new identifiers. UA classification is not proof of physical OS.",
  "automation": "Known bots, HeadlessChrome, internal-test header, preview hosts and explicit dmc_analytics_exclude cookie excluded. Unmarked internal traffic cannot be identified retrospectively.",
  "ties": "Unique viewers descending, canonical URL ascending",
  "pins": "Editorial placement only; measured ranks unchanged",
  "refresh": "Explicit refresh function implemented; daily scheduler not yet configured or exercised",
  "failureRecovery": "Snapshot replaced only after successful aggregation; previous database snapshot retained on aggregation failure. Cold-start database unavailability shows unavailable.",
  "complete": false
}