{
 "metric": "cert-trust",
 "segment": "jp",
 "anchor": "domain",
 "label": "Japan (domains)",
 "population": "domains in Japan",
 "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": 265,
  "qf_pct": 13.96,
  "ci": [
   10.3,
   18.65
  ],
  "dist": {
   "self_signed": 2.64,
   "hostname_mismatch": 11.32,
   "ok": 86.04
  },
  "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
 },
 "series": [
  {
   "day": "2026-08-01",
   "n": 89,
   "qf_pct": 21.35,
   "ci": [
    14.11,
    30.95
   ],
   "dist": {
    "ok": 78.65,
    "hostname_mismatch": 20.22,
    "self_signed": 1.12
   },
   "snapshot": "common-crawl-domain-stratified-c150-g2500-seed20260729"
  },
  {
   "day": "2026-08-03",
   "n": 91,
   "qf_pct": 20.88,
   "ci": [
    13.79,
    30.32
   ],
   "dist": {
    "ok": 79.12,
    "hostname_mismatch": 19.78,
    "self_signed": 1.1
   },
   "snapshot": "common-crawl-domain-stratified-c150-g2500-seed20260729"
  },
  {
   "day": "2026-08-04",
   "n": 266,
   "qf_pct": 15.04,
   "ci": [
    11.24,
    19.83
   ],
   "dist": {
    "ok": 84.96,
    "hostname_mismatch": 12.03,
    "self_signed": 3.01
   },
   "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
  },
  {
   "day": "2026-08-05",
   "n": 267,
   "qf_pct": 14.61,
   "ci": [
    10.87,
    19.34
   ],
   "dist": {
    "ok": 85.39,
    "hostname_mismatch": 11.61,
    "self_signed": 3
   },
   "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
  },
  {
   "day": "2026-08-12",
   "n": 265,
   "qf_pct": 13.96,
   "ci": [
    10.3,
    18.65
   ],
   "dist": {
    "self_signed": 2.64,
    "hostname_mismatch": 11.32,
    "ok": 86.04
   },
   "snapshot": "common-crawl-domain-stratified-c400-g2500-seed20260729"
  }
 ],
 "license": "CC BY 4.0",
 "source": "https://quietfailures.com/datasets/cert-trust/jp"
}