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Logs tell you 'What' happened; Metrics tell you 'How' your system is feeling. Dashboards are the cockpit of your architectural engine.
Prometheus uses a 'Pull' model. It scrapes an `/metrics` endpoint on your .NET app every 15 seconds. It record **Quantities**: - CPU / Memory usage. - Active thread count. - HTTP request throughput and failure rates. - Database connection pool health.
Grafana connects to Prometheus and turns the data into beautiful, real-time graphs. **Architect Tip:** A 'Red' dashboard in the office (or on a shared Slack channel) is the fastest way to alert the team that the latest deployment is causing a memory leak or a performance regression.
Don't stare at dashboards. Use **AlertManager** to trigger Slack/PagerDuty notifications when a metric crosses a dangerous threshold (e.g., 'Error rate > 5% for more than 2 minutes').
Q: "What are the 'Golden Signals' you monitor for every service?"
Architect Answer: "Google's 4 Golden Signals: **Latency** (time to complete), **Traffic** (demand/requests per second), **Errors** (rate of failure), and **Saturation** (how 'full' the service is, e.g., memory/CPU). If these four are healthy, the service is likely healthy."
Quizzes linked to this course—pass to earn certificates.
On this page
1. Prometheus (The Collector) 2. Grafana (The Artist) 3. AlertManager 4. Interview Mastery