{
 "metric": "cert-trust",
 "segment": "gb-small",
 "anchor": "company",
 "label": "UK small companies",
 "population": "UK small 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": 758,
  "qf_pct": 11.48,
  "ci": [
   9.4,
   13.94
  ],
  "dist": {
   "ok": 88.52,
   "hostname_mismatch": 9.23,
   "self_signed": 2.24
  },
  "snapshot": "uk-companies-house-per600-seed20260728"
 },
 "series": [
  {
   "day": "2026-08-01",
   "n": 349,
   "qf_pct": 8.88,
   "ci": [
    6.33,
    12.33
   ],
   "dist": {
    "ok": 91.12,
    "hostname_mismatch": 7.74,
    "self_signed": 1.15
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-03",
   "n": 359,
   "qf_pct": 9.19,
   "ci": [
    6.62,
    12.63
   ],
   "dist": {
    "ok": 90.81,
    "hostname_mismatch": 8.08,
    "self_signed": 1.11
   },
   "snapshot": "uk-companies-house-per300-seed20260728"
  },
  {
   "day": "2026-08-04",
   "n": 753,
   "qf_pct": 11.16,
   "ci": [
    9.1,
    13.6
   ],
   "dist": {
    "hostname_mismatch": 8.76,
    "ok": 88.84,
    "self_signed": 2.39
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-05",
   "n": 755,
   "qf_pct": 11.26,
   "ci": [
    9.2,
    13.71
   ],
   "dist": {
    "ok": 88.74,
    "hostname_mismatch": 8.87,
    "self_signed": 2.38
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  },
  {
   "day": "2026-08-12",
   "n": 758,
   "qf_pct": 11.48,
   "ci": [
    9.4,
    13.94
   ],
   "dist": {
    "ok": 88.52,
    "hostname_mismatch": 9.23,
    "self_signed": 2.24
   },
   "snapshot": "uk-companies-house-per600-seed20260728"
  }
 ],
 "license": "CC BY 4.0",
 "source": "https://quietfailures.com/datasets/cert-trust/gb-small"
}