- A perceived paradigm shift in system monitoring and debugging that uses a unified data storage model based on arbitrarily-wide structured log events as a single source of truth, rather than the traditional “three pillars” approach (metrics, logs, and traces) stored in disparate tools. The term was coined in 2024 by Charity Majors to distinguish the respective generation of tooling from the APM-centric “Observability 1.0” approach.
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