{
  "run": "production redirect benchmark, 2026-10-12",
  "commit": "1afd3a1 (last server change; main was at db17d5a)",
  "target": "https://shortened.cv/{slug}, one active link, 302 to https://example.com/?ref=smoke",
  "path": "k6 -> public IP -> Traefik (TLS, Let's Encrypt) -> Go API -> in-process cache; every click recorded through the Redis stream into PostgreSQL",
  "host": {
    "provider": "Contabo VPS shared with two other applications, managed by Coolify",
    "cpu": "AMD EPYC Processor (with IBPB), 4 vCPU, KVM",
    "memory": "7.8 GiB",
    "os": "Ubuntu 24.04.5 LTS"
  },
  "load_generator": {
    "tool": "k6 v2.3.0",
    "location": "same VPS, so it shared the 4 vCPUs with the services under test",
    "connections": "keep-alive; each virtual user reuses its TLS connection",
    "user_agent": "desktop Chrome string, so requests are recorded as human clicks"
  },
  "api": {
    "instances": 1,
    "click_queue": "redis",
    "app_env": "development (production mode was not yet enabled; it changes cookie flags, not the redirect path)"
  },
  "runs": {
    "run1-50-to-1000": "60 s per step at a constant arrival rate, no warm-up. Stops when errors exceed 1% or p95 exceeds 500 ms.",
    "run2-1000-to-3000": "20 s ramp to the target rate, then 60 s held. Only the held window is measured (hold_* metrics) and checked against the same limits."
  },
  "measurement": {
    "cpu": "vmstat and top sampled every 5 s; process CPU is a percentage of one vCPU"
  }
}