What is an EventBridge (CloudWatch Events) trigger?

Amazon EventBridge (formerly CloudWatch Events) is a serverless event bus that enables you to connect application data from your own apps, AWS services, and Software-as-a-Service (SaaS) applications. You can use EventBridge to trigger Lambda functions in response to system events, custom application events, or scheduled rules.

Types of EventBridge Triggers for Lambda

1
Scheduled rules – invoke Lambda at fixed intervals (e.g., cron jobs)
2
AWS service events – respond to events from services like EC2, S3, RDS
3
Custom events – send events from your own applications
4
SaaS partner events – respond to events from integrated SaaS providers

Steps to Use EventBridge as a Trigger

1
Open Amazon EventBridge in the AWS Console
2
Create a new rule and choose event pattern or schedule
3
As target, choose 'Lambda function' and select the function
4
Set permissions to allow EventBridge to invoke the Lambda
5
Save the rule and test by generating the associated event

Sample Scheduled Rule (Cron) JSON