Infrastructure2026-05-17
Observability
Also known as: Observability / 可観測性 / オブザーバビリティ
The practice of making system internals visible through the three pillars of metrics, logs, and traces. The goal is to understand system state from external observations alone. Datadog, Sentry, and OpenTelemetry are leading tools.
Three Pillars
Combining metrics (numeric time-series), logs (event records), and traces (request tracking) enables rapid problem identification in microservice and serverless environments.
AI Application Use
Visualizing LLM application latency, error rates, and costs through observability tools has become standard practice from 2026 onward. OpenTelemetry enables vendor-neutral data collection compatible with Datadog, Grafana, and others.
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