AWS Batch now emits CloudWatch Events as your jobs transition from one state to another. In the past, in order to obtain updates on the state of a running AWS Batch job, customers have had to rely on periodically polling the state of each job using the AWS CLI or an SDK. With the new AWS Batch event stream feature, it is now possible to retrieve near real-time, event-driven updates on the state of your AWS Batch jobs. Events are delivered through Amazon CloudWatch Events, and can be routed to any valid CloudWatch Events target, such as an AWS Lambda function or an Amazon SNS topic.