Aws Eventbridge

EventBridge is the event backbone of modern AWS architectures — publish events to a bus, define rules that match event patterns, and route matching events to targets (Lambda, SQS, SNS, Step Functions, API destinations, etc.). For agents: publish domain events via PutEvents, set up routing rules, trigger workflows on schedules, and replay archived events for debugging. EventBridge Pipes connects event sources to targets with optional filtering and enrichment. EventBridge Scheduler replaces CloudWatch Events for cron-based invocations. Confidence is docs-derived.

AWS SDK (boto3): eb = boto3.client("events"). eb.put_events(Entries=[{Source: "com.myapp", DetailType: "OrderPlaced", Detail: json.dumps({orderId: "123"}), EventBusName: "my-bus"}]). put_rule for event pattern or schedule rules. put_targets assigns rule targets. eb.list_event_buses() lists buses. EventBridge Scheduler: scheduler = boto3.client("scheduler"). scheduler.create_schedule(Name="daily-job", ScheduleExpression="cron(0 9 * * ? *)", Target={Arn: lambda_arn, RoleArn: role_arn}).

IAM auth: AWS credentials. Per-operation: events:PutEvents, events:PutRule, events:PutTargets, scheduler:CreateSchedule. Resource-based policies for cross-account event bus access. Event bus policies control who can publish. HTTPS enforced.

Delivery failures: failed invocations go to DLQ (if configured on target) or CloudWatch Dead-letter queue metrics. PutEvents: partial failures returned in FailedEntryCount. Retry policy: configurable per target (maximum retries + event age). EventBridge SLA: 99.99%. Custom events limited to 256 KB. Event pattern matching is server-side — incorrect patterns silently fail to match (test with TestEventPattern).

docs.aws.amazon.com/eventbridge is comprehensive — event buses, rules, targets, schema registry, pipes, scheduler, and archive/replay. Getting started: create event bus, define a rule, test with PutEvents in under 10 minutes. Free tier: 14M custom events/month. EventBridge Scheduler: 14M scheduler invocations/month free. Community via AWS Forums and re:Invent sessions.