Karka monitoring hub (API)

This host is the Axum API, not the React dashboard. Open your frontend URL in the browser (the container built from frontend/Dockerfile).

• GET /health — liveness (same as GET /healthz)
• GET /api/current — metrics JSON
• GET /api/history?metric=cpu&duration=1h — optional node_id= for hub DB samples

Behind one domain with nginx/Traefik: route / to the frontend and /api, /ws to this service.

To auto-redirect from here: set env PUBLIC_DASHBOARD_URL to your dashboard base URL.