Observability is the ability to understand the internal state of a system by examining its external outputs. It's about being able to ask arbitrary questions about your system's behavior and get answers from the data you collect. Monitoring is the practice of collecting, aggregating, and acting on metrics and logs from your systems. It typically involves predefined dashboards and alerts for known issues. Key differences:
Scope: Monitoring focuses on known problems; observability helps discover unknown issues
Approach: Monitoring is reactive; observability is more exploratory
Data: Monitoring uses predetermined metrics; observability requires rich, high-cardinality data
Questions: Monitoring answers "Is the system working?"; observability answers "Why isn't it working?"
Rewriting in plainer words…
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