Observability

Health checks, Prometheus metrics, and the dev dashboard.

Two endpoints are served directly by Rust:

• /_gio/health — liveness probe, always on
• /_gio/metrics — Prometheus metrics, opt-in via [metrics] in gio.toml

[metrics]
enabled = true
token = "a-long-random-secret"   # secure it for production

Dev dashboard

In development, /_gio/devtools shows live request logs, route manifest, cache stats, a memory sparkline, and IPC latency — generated entirely in Rust.