A valid JSON string. There is no other schema imposed. The JSON string may contain fields and nested sub-objects.
A free-form string, with a maximum of 128 characters, used to decide what fields to expect in the event detail.
Amazon Web Services resources, identified by Amazon Resource Name (ARN), which the event primarily concerns. Any number, including zero, may be present.
The event source that is generating the entry.
The date and time of the event.