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jEAP Reaction Observer is a library that detects, tracks, and documents how microservices respond to incoming events such as messages, API requests, or scheduled triggers. It enables automated observation of runtime behaviour, capturing both the type and frequency of reactions across distributed systems. The library emits Reaction Identified Events when a new behavioural pattern is first observed, and Reactions Observed Events to provide aggregated statistics over time. This data forms the foundation for system behaviour documentation, helping architects and developers understand service dynamics without relying on manual documentation. By integrating with the jEAP ArchRepo, the Reaction Observer enriches the generated documentation with insightful runtime behaviour patterns.