Add enriched metadata to Amazon VPC flow logs published to CloudWatch Logs and S3
Now you can include enriched metadata in Amazon Virtual Private Cloud (Amazon VPC) flow logs published to Amazon CloudWatch Logs or Amazon Simple Storage Service (S3). Prior to this launch, custom format VPC flow logs enriched with additional metadata could be published only to S3. With this launch, we are also adding metadata fields that provide insights about the location of the network interface on which flow logs are being captured, such as the AWS Region, AWS Availability Zone, AWS Local Zone, or AWS Outpost where it resides.
Source:: Amazon AWS