Final answer:
A webhook alert action generates a JSON file with details like the timestamp, event description, severity level, and identifiers. It may also contain custom data pertaining to the application or service requirements.
Step-by-step explanation:
When a webhook alert action is generated, the JSON file typically includes a payload of information that the server will send to the specified URL. This payload usually contains detailed facts about the event or issue that triggered the alert. Specifically, a webhook payload might include details such as a timestamp of when the event occurred, a description of the event, the severity level of the alert, and unique identifiers for tracing the event within the system. Additionally, the JSON may include custom data that has been defined according to the application's or service's specific needs.