Delivery level for AWS service events - Amazon EventBridge
Services or capabilities described in AWS documentation might vary by Region. To see the differences applicable to the AWS European Sovereign Cloud Region, see the AWS European Sovereign Cloud User Guide.

Delivery level for AWS service events

Each AWS service that generates events sends them to EventBridge as either best effort or durable delivery attempts.

  • Best effort delivery means that the service attempts to send all events to EventBridge, but in some rare cases an event might not be delivered.

  • Durable delivery means the service will successfully attempt to deliver events to EventBridge at least once.

Once a valid event is delivered to EventBridge, EventBridge matches it against rules and then follows the retry policy and any dead-letter queue specified for the event target(s). For more information, see Retrying event delivery in the EventBridge User Guide.