Kamu Wajib Tahu Best Practice Logging Management
Logging Management dari Nol: console.log → Centralized Logging (Alloy → Loki → Grafana)Lognya jalan lancar di laptop sendiri, semua hijau, kelihatan aman. Justru itu jebakannya. Di video ini kita bedah pelan-pelan kenapa `console.log` nggak cukup, terus naik bertahap sampai punya centralized logging yang beneran kepakai pas aplikasi di-scale ke banyak container.
Studi kasusnya 2 microservice kecil (order-service & payment-service) jalan di Bun, dibungkus container pakai Podman, dan log-nya dikumpulin ke Grafana Loki lewat Grafana Alloy.
💻 SOURCE CODE (GITHUB)
https://github.com/ProgrammerZamanNow/logging-management-demo
Tiap babak ada di branch-nya sendiri, tinggal checkout buat ngikutin:
- Babak 1 (console.log) ......... git checkout 01-console-log
- Babak 2 (structured logging) .. git checkout 02-proper-logging
- Babak 3 (di-scale) ............ git checkout 03-scale
- Babak 4 (centralized logging) . git checkout 04-centralized
⏱️ TIMELINE
00:00 — Pendahuluan
02:05 — Bagian 1 Titik Awal
08:49 — Bagian 2 Beresin Lognya di Aplikasi
21:27 — Bagian 3 Pas di-scale mulai kacau
28:32 — Bagian 4 Centralized Logging
36:13 — Kesimpulan
📌 YANG DIBAHAS
- Kenapa `console.log` jadi masalah: log nggak rapi buat mesin, bisa bocorin data sensitif (password), dan nggak bisa dilacak antar service.
- Structured logging: log berbentuk JSON, ada level (info/warn/error), sensor data sensitif (redact), dan pasang requestId buat ngelacak satu request ujung ke ujung.
- Masalah pas di-scale: log kececer di banyak container, hilang pas container restart, dan risiko disk penuh kalau nulis ke file. Makanya: stdout only, jangan ke file.
- Centralized logging ala 12-Factor App: aplikasi cukup buang log ke stdout, infrastruktur yang ngumpulin (Alloy), nyimpen (Loki), dan nyediain pencarian (Grafana).
- Label vs structured metadata di Loki: kenapa requestId TIDAK dijadikan label (high cardinality explosion), dan cara nyimpen field cardinality-tinggi yang tetap bisa difilter.
- Kenapa pakai Grafana Alloy, bukan Promtail (Promtail sudah disetop 2 Maret 2026).
🧰 STACK & TOOLS
- Bun (runtime + HTTP server)
- Pino (structured logging)
- Podman + podman-compose (container)
- nginx (load balancer)
- Grafana Alloy (pengumpul log)
- Grafana Loki (penyimpan & mesin query)
- Grafana + LogQL (pencarian & dashboard)
✅ ATURAN MAIN LOGGING
1. Pakai library logging + level, jangan console.log
2. Lognya JSON
3. Sensor data sensitif (redact)
4. Pasang requestId buat ngelacak
5. Buang ke stdout, jangan ke file
6. Kirim ke centralized logging (Alloy → Loki → Grafana)
#logging #observability #grafana #loki #podman #microservices #devops #bun
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