DevOps Intermediate

What is Monitoring?

The practice of collecting, analyzing, and alerting on system metrics and logs to ensure application health and performance.

Monitoring provides visibility into system behavior. Metrics monitoring tracks CPU, memory, disk, and network usage. Application monitoring tracks response times, error rates, and throughput. Log monitoring aggregates and searches through application logs.

Popular tools include Prometheus + Grafana (metrics), ELK Stack (logs), Datadog (full-stack), and PagerDuty (alerting). The three pillars of observability are metrics, logs, and traces.

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