Monitoring vs Observability: Knowing Something's Wrong vs Knowing Why

Sun, 02 Aug 2026 08:34:10 +0900

Overview

Monitoring watches a predefined set of metrics, logs, and checks against known failure modes and alerts you when thresholds are breached. Observability is a property of a system built so that its internal state can be inferred from its external outputs, letting you investigate questions you didn’t think to ask in advance. The distinction matters because monitoring answers ‘is something wrong?’ while observability answers ‘why is it wrong?’ for failures you’ve never seen before.

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Monitoring vs Observability: Knowing Something's Wrong vs Knowing Why

Overview