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Box 3:

Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

References:
https://docs.microsoft.com/en-us/azure/virtual-machines/windows/sql/virtual-machines-windows-sql- performance

A webhook allows you to start a particular runbook in Azure Automation through a single HTTP request.

Box 1: HTTP Post
To use a webhook after it has been created, your client application must issue an HTTP POST with the URL for the webhook.
Box 2: RequestHeaders
Box 3: WebhookData
When a client starts a runbook using a webhook, it cannot override the parameter values defined in the webhook. To receive data from the client, the runbook can accept a single parameter called $WebhookData of type [object] that will contain data that the client includes in the POST request.
The $WebhookData object will have the following properties:
References: https://docs.microsoft.com/en-us/azure/automation/automation-webhooks