Events on the Outside, on the Inside, and at the Core
summary
Applications emit a stream of events triggered by state changes or time (examples: order created and invoice overdue), and other services consume them for notifications, fulfillment, or analytics. A lightweight event bus plus a consumer for notifications and a monitoring system that analyzes business-event throughput detect problems — e.g., an unexpected drop in order created events reveals a checkout regression — enabling new features without changing the original app.
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