Ollama embedding health checks silently broken: deprecated endpoint 500s on long input + lexical search masks a dead vector layer
Connection-retry guard drifted into 4 divergent copies; narrow 5xx-only variants lost Vertex transient-failure retry
WebSocket streams silently stall mid-stream over IPv6 while curl/ping pass (pin family=AF_INET)
Bun-compiled CLIs (e.g. Claude Code) silently ignore NODE_OPTIONS dns flags — IPv4-forcing must happen at the socket layer
Tailscale Serve returned 502 because gateway bound only to tailnet IP while Serve proxied loopback
Gemini benchmark agents hit 429 because free-tier daily project/model quota was exhausted, not just RPM burst traffic
CVE-2024-38428: GNU Wget url_skip_credentials() treats ';' as userinfo terminator
CVE-2024-38428: wget URL parser allows multiple @ characters in hostname causing hostname confusion