You Can't Fix What You Can't See

How do you know your server is healthy right now? Is CPU at 90%? Is the disk almost full? Are response times increasing? If you can't answer these questions instantly, you need monitoring.

Most businesses discover problems the worst way possible: customers complain. By then, you've already lost revenue and trust. Good monitoring means you know about issues before your users do.

The Monitoring Stack

Prometheus collects metrics from your servers and applications. It scrapes data every 15 seconds and stores it in a time-series database. Think of it as a tireless data collector.

Grafana visualizes those metrics in beautiful, customizable dashboards. CPU usage over time, memory trends, request rates — all in real-time charts you can actually understand.

Alertmanager sends notifications when things go wrong. Email, Slack, Telegram, PagerDuty — choose your channel.

What to Monitor

Start with the basics (the "USE" method):

  • Utilization — CPU, memory, disk usage percentage
  • Saturation — queue lengths, swap usage, I/O wait
  • Errors — 5xx responses, failed requests, connection timeouts

For web applications, add:

  • Response time (p50, p95, p99)
  • Request rate (requests per second)
  • Error rate (percentage of failed requests)
  • Database query time

Alerting Done Right

The biggest mistake in monitoring is too many alerts. If everything is "critical," nothing is. Follow these rules:

  1. Alert on symptoms, not causes — "website is slow" is better than "CPU is high"
  2. Set meaningful thresholds — 80% disk usage is a warning, 95% is critical
  3. Include runbook links — every alert should tell you what to do next
  4. Avoid alert fatigue — if you're ignoring alerts, your thresholds are wrong

Getting Started

The easiest way to start is with Docker Compose. Prometheus, Grafana, and node_exporter can be running in under 10 minutes. There are also excellent community dashboards for common setups — no need to build from scratch.

If your infrastructure runs without monitoring, you're flying blind. I can set up a complete monitoring stack for your infrastructure in a day. Reach out and stop guessing.