EventBridge Event Patterns and Rules

~10 min read

How EventBridge decides which events go to which targets, based on actual event content.

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Key points

  • Event patterns match against source, detail-type, and detail fields — more expressive than SNS filtering
  • One event can match multiple rules, fanning out to multiple targets based on content
  • Default bus (AWS service events), custom buses (your app), and partner buses (third-party SaaS) organize routing by domain
  • Producers don't need to know in advance which rules will match their published events