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Fundamentals · Medium · Free

Logs, metrics, traces — the three pillars on cloud apps.

FresherFundamentalsCloud Basics
Model answer

Logs, metrics, traces

For Logs, metrics, traces — the three pillars on cloud apps., interviewers listen for a crisp definition, how the pieces interact in a real system, and one trade-off or failure mode you have seen or would guard against.

  • Logs: discrete events (JSON structured).
  • Metrics: aggregated counters/gauges (CPU, latency p99).
  • Traces: request path across microservices (OpenTelemetry).
Alert on SLOs (error rate, latency)—not every log line.