Prometheus metrics at /metrics and pprof at /debug/pprof/ are served on SEIKAN_METRICS_ADDR (default 127.0.0.1:9090) — bound to localhost, so scrape locally or over an SSH tunnel. Key series:
| Metric | Meaning |
|---|---|
seikan_http_requests_total{frontend,method,code} |
Proxied HTTP requests. |
seikan_http_request_duration_seconds{frontend} |
Per-frontend request latency histogram. |
seikan_tunnel_bytes_total{direction} |
Bytes tunneled (in/out). |
seikan_active_tunnels / seikan_tunnel_connects_total |
Connected tunnels / total connects. |
seikan_active_tcp_connections |
In-flight public TCP connections. |
seikan_auth_failures_total{kind} |
Rejected auth attempts (api_key / token). |
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