16. AWS CloudTrail { "eventVersion": "1.01", "userIdentity": {"type": "Root", "principalId": "...", "arn": "...", "accountId": "...", "accessKeyId": "..."}, "eventTime": "2014-10-27T20:53:07Z", "eventSource": "cloudsearch.amazonaws.com", "eventName": "DescribeDomains", "awsRegion": "us-east-1", "sourceIPAddress": "...", "userAgent": "aws-sdk-java/unknown-version Linux/2.6.18-164.el5 Java_HotSpot(T