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Observability and Monitoring for Modern Apps Observability helps teams understand how a system behaves, especially when something is not right. In modern apps, you use metrics, logs, and traces to see the full story. This post offers practical ideas to set up observability that is useful, not overwhelming. What to monitor in modern apps Performance metrics: latency at key endpoints, request rate, error rate, and resource saturation. Logs: structured messages with context, errors and warnings, and correlation IDs to connect events across services. Distributed traces: a map of how a user request moves through services, showing delays and bottlenecks. System health: CPU, memory, disk, queue lengths, and container restarts. Application health: feature flags, dependency status, and health endpoints. Three pillars of observability ...