zeavis-edu/METRICS.md

ZeaVis Edu — Metrics Endpoints

This document lists every Prometheus metrics endpoint exposed by the ZeaVis Edu application stack and the payload each service provides.

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Overview

Service	Host (prod)	Metrics Endpoint	Port (local)
Web (Vite dev)	zeavisedu.asepharyana.my.id	GET /metrics	5173
API (Elysia)	api-zeavisedu.asepharyana.my.id	GET /metrics	4006
ML Service (Axum)	ml-zeavisedu.asepharyana.my.id	GET /metrics	4012
Prometheus Collector	—	GET /metrics (self)	9090

In production all metrics are scraped by the Prometheus collector running in the Telemetry stack on a separate VPS connected via Tailscale. See telemetry/prometheus/targets/ for the auto‑discovery configuration. Target files must use Tailscale IPs (e.g. 100.x.x.a:4006), not Docker hostnames, because the services are on different hosts.

In production (nginx), the web app proxies /metrics to the API service: see apps/web/nginx.conf.

For local development the Vite plugin vite-plugin-metrics.ts serves client‑side session metrics at GET /metrics on the Vite dev server.

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1. Web App — GET /metrics

Endpoint	Description
/metrics	Vite dev‑server middleware + client‑side snapshot

Metrics

Metric Name	Type	Labels	Description
zeavis_web_page_views_total	counter	—	Total page views this session
zeavis_web_vital_bucket	gauge	name, rating	Last‑seen Web Vitals (CLS, FCP, INP…)

Development: served inline by the Vite plugin vite-plugin-metrics.ts. Production: the static frontend serves no /metrics endpoint — consider forwarding the Vite dev server, or use the Telemetry collector to scrape client‑side beacons.

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2. API (Elysia/Bun) — GET /metrics

Endpoint	Description
/metrics	Prometheus text format via prom-client

Metrics

Metric Name	Type	Labels	Description
zeavis_api_http_requests_total	counter	method, path, status	Total HTTP requests
zeavis_api_http_request_duration_seconds	histogram	method, path	Request latency buckets
zeavis_api_http_requests_active	gauge	—	Concurrently‑handled requests
zeavis_api_classifications_total	counter	result	AI image classifications
zeavis_api_diagnoses_total	counter	disease	Created diagnoses
zeavis_api_auth_operations_total	counter	operation, success	Login / register attempts
Default Node.js metrics	various	—	CPU, memory, event‑loop lag, GC …

Source: apps/api/src/lib/telemetry.ts, instrumented in routes/.

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3. ML Service (Rust/Axum) — GET /metrics

Endpoint	Description
/metrics	Prometheus text format via prometheus crate

Metrics

Metric Name	Type	Labels	Description
zeavis_ml_http_requests_total	counter	—	Total HTTP requests
zeavis_ml_http_request_duration_seconds	histogram	—	Request latency buckets
zeavis_ml_http_requests_active	gauge	—	Concurrently‑handled requests
zeavis_ml_predictions_total	counter	—	Successful ONNX predictions
zeavis_ml_model_load_status	gauge	—	1 = loaded, 0 = not loaded
Process metrics (libc/procfs)	various	—	RSS, CPU, fd count …

Source: apps/ml-service/src/telemetry.rs, instrumented in routes.rs.

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Prometheus Auto‑Discovery (Telemetry Stack)

The Telemetry submodule includes a Prometheus instance that uses file_sd_configs to discover targets. Place a target file under telemetry/prometheus/targets/ with content such as:

[
  {
    "targets": ["100.x.x.a:4006"],
    "labels": { "service": "zeavis-api", "component": "backend", "env": "production" }
  },
  {
    "targets": ["100.x.x.b:4012"],
    "labels": { "service": "zeavis-ml", "component": "inference", "env": "production" }
  }
]

⚠️ Cross-VPS: Gunakan IP Tailscale (bukan Docker hostname) karena Prometheus dan ZeaVis Edu berjalan di VPS berbeda. Pastikan port service (:4006, :4012) terekspos di 0.0.0.0 atau diizinkan oleh aturan iptables/ufw untuk interface Tailscale (tailscale0/100.x.x.x/10).

The Prometheus config (in telemetry/prometheus/prometheus.yml) will automatically pick up new files within its 15‑second scrape interval — no restart required.