The four golden signals

Latency, traffic, errors and saturation describe the health of almost any service. Alert on them before alerting on CPU or memory.

Where it shows up in real systems

  • Metrics

    The four golden signals tell you something is wrong before users do. Without metrics, failures are only noticed when customers complain, which multiplies recovery time.

    In production: Prometheus, Datadog, Amazon CloudWatch, Grafana Mimir

See it break, then fix it

Build an architecture, send it a day of traffic and outages, and learn why it holds or fails. Free to start.

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