Replace guesswork with observability.

Goal

Know what production is doing before users tell you.

This phase introduces hosted tools like Datadog or open-source telemetry systems using OpenTelemetry, Prometheus, Grafana, Loki, and error tracking.

Build

• Structured production logs.
• Metrics for request rate, latency, errors, and database usage.
• Tracing across frontend, Go API, database, cache, and workers.
• Alerts, dashboards, backups, restore tests, and rollback drills.

Concepts

• Observability.
• OpenTelemetry.
• SLOs and error budgets.
• Backups and restores.
• Incident response and deployment safety.

Prompt stub

Add basic production observability.
Use structured logs and OpenTelemetry concepts.
Explain the difference between logs, metrics, and traces.
Suggest either Datadog or an open-source stack, but keep the first implementation small.

Done means

• Errors can be diagnosed without asking a user for screenshots.
• Slow endpoints and worker failures are visible.
• Backups are tested, not just configured.
• The learner understands why operations are part of product quality.