Observability.
also: three pillars of observability · metrics logs and traces · observability stackUnderstanding 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.