{
 "metric": "cert-trust",
 "segment": "gb-medium-large",
 "anchor": "company",
 "label": "UK medium & large companies",
 "population": "UK medium & large companies",
 "states": [
  "ok",
  "hostname_mismatch",
  "self_signed"
 ],
 "quiet_failure_states": [
  "hostname_mismatch",
  "self_signed"
 ],
 "measurement": "Tier 2; compare issuer/subject and check the SAN list covers the host. Denominator: `has_web`.",
 "why_it_matters": "HTTPS is present, the port is open, TLS negotiates — and every visitor gets a browser warning, or would if they checked. Encryption without authentication.",
 "limits": null,
 "data_tier": "tls",
 "population_predicate": "has_web",
 "entity_type": "domain",
 "kind": "failure",
 "latest": {
  "day": "2026-08-12",
  "n": 784,
  "qf_pct": 10.71,
  "ci": [
   8.74,
   13.07
  ],
  "dist": {
   "ok": 89.29,
   "hostname_mismatch": 9.18,
   "self_signed": 1.53
  },
  "snapshot": "uk-companies-house-per600-seed20260728"
 },
 "series": [
  {
   "day": "2026-08-01",
   "n": 429,
   "qf_pct": 11.66,
   "ci": [
    8.95,
    15.04
   ],
   "dist": {
    "ok": 88.34,
    "hostname_mismatch": 9.09,
    "self_signed": 2.56
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-03",
   "n": 431,
   "qf_pct": 11.83,
   "ci": [
    9.12,
    15.22
   ],
   "dist": {
    "ok": 88.17,
    "hostname_mismatch": 9.05,
    "self_signed": 2.78
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-04",
   "n": 785,
   "qf_pct": 11.08,
   "ci": [
    9.07,
    13.47
   ],
   "dist": {
    "ok": 88.92,
    "hostname_mismatch": 9.3,
    "self_signed": 1.78
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-05",
   "n": 784,
   "qf_pct": 10.71,
   "ci": [
    8.74,
    13.07
   ],
   "dist": {
    "self_signed": 1.53,
    "ok": 89.29,
    "hostname_mismatch": 9.18
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-12",
   "n": 784,
   "qf_pct": 10.71,
   "ci": [
    8.74,
    13.07
   ],
   "dist": {
    "ok": 89.29,
    "hostname_mismatch": 9.18,
    "self_signed": 1.53
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  }
 ],
 "license": "CC BY 4.0",
 "source": "https://quietfailures.com/datasets/cert-trust/gb-medium-large"
}