{
 "metric": "cert-trust",
 "segment": "gb",
 "anchor": "domain",
 "label": "the UK (domains)",
 "population": "domains in the UK",
 "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": 170,
  "qf_pct": 7.65,
  "ci": [
   4.52,
   12.64
  ],
  "dist": {
   "ok": 92.35,
   "hostname_mismatch": 5.29,
   "self_signed": 2.35
  },
  "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
 },
 "series": [
  {
   "day": "2026-08-01",
   "n": 62,
   "qf_pct": 4.84,
   "ci": [
    1.66,
    13.29
   ],
   "dist": {
    "ok": 95.16,
    "hostname_mismatch": 1.61,
    "self_signed": 3.23
   },
   "snapshot": "common-crawl-domain-stratified-c150-g2500-seed20260729"
  },
  {
   "day": "2026-08-03",
   "n": 62,
   "qf_pct": 4.84,
   "ci": [
    1.66,
    13.29
   ],
   "dist": {
    "ok": 95.16,
    "hostname_mismatch": 1.61,
    "self_signed": 3.23
   },
   "snapshot": "common-crawl-domain-stratified-c150-g2500-seed20260729"
  },
  {
   "day": "2026-08-04",
   "n": 171,
   "qf_pct": 7.6,
   "ci": [
    4.5,
    12.57
   ],
   "dist": {
    "ok": 92.4,
    "hostname_mismatch": 5.26,
    "self_signed": 2.34
   },
   "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
  },
  {
   "day": "2026-08-05",
   "n": 170,
   "qf_pct": 7.65,
   "ci": [
    4.52,
    12.64
   ],
   "dist": {
    "ok": 92.35,
    "hostname_mismatch": 5.29,
    "self_signed": 2.35
   },
   "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
  },
  {
   "day": "2026-08-12",
   "n": 170,
   "qf_pct": 7.65,
   "ci": [
    4.52,
    12.64
   ],
   "dist": {
    "ok": 92.35,
    "hostname_mismatch": 5.29,
    "self_signed": 2.35
   },
   "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
  }
 ],
 "license": "CC BY 4.0",
 "source": "https://quietfailures.com/datasets/cert-trust/gb"
}