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Observability.

also: three pillars of observability · metrics logs and traces · observability stack

Understanding a system's behaviour from its outputs (metrics, logs, traces) well enough to answer questions you didn't anticipate.

the two-minute refresher

Monitoring watches known problems with predefined dashboards and alerts.
Observability lets you explore unknown ones: 'why is this user's request slow?'
Metrics alert you, traces show where, logs explain why.
Correlation IDs (a trace ID in every log line) glue the three together.

Where the course teaches it

W10 · Day 2Observabilitylearn it →W10 · Day 2Observabilityrevisit →W06 · Day 5Operations, Scale and Edge Casesrevisit →

Related concepts

Distributed tracing
Metric cardinality
Four golden signals
Structured logging