3.3.1. Event Sources & Processing

When a production database fails over, an EC2 instance terminates unexpectedly, or an API endpoint starts returning 500 errors — how fast does your team find out? In a mature DevOps environment, the answer is "before users notice," because events from AWS services are captured, routed, and processed automatically. Think of EventBridge as a postal sorting facility — events arrive from dozens of sources, get matched against routing rules, and are delivered to the right handler without anyone manually reading each envelope. Without this automation, your incident response is reactive: you wait for complaints, then scramble to investigate.

This section covers which AWS services generate operational events, how to route them using EventBridge and other patterns, and how to build workflows that transform raw events into automated actions.

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