{"version":"2.0.54","anchor":"cdn-dark-read-testing","canonical_anchor":"cdn-dark-read-testing","heading":"CDN Dark Read Testing","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.0.54\/e\/cdn-dark-read-testing","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.0.54","markdown":"### CDN Dark Read Testing\n\n**What:** Parallel download attempts from new CDN infrastructure (`downloads.claude.ai`) alongside the primary Google Cloud Storage source, for performance testing without user impact.\n\n**Details:**\n\n- Runs silently in background during binary downloads\n- Collects latency, success\/failure, and error type metrics\n- Reports via `tengu_native_cdn_dark_read_failure` telemetry event\n- Creates temporary `claude-cdn-dark-read-*` directories, automatically cleaned up\n- **Evidence**: `kp5()` at line 428907, `Ah2` CDN URL at line 428959"}