The latest update for Edge Diagnostics include:
A new boolean TraceForwardLogs parameter in the Translate Error String endpoint in Edge Diagnostics v1 API and also a toggle in UI. It allows you to trace either all the logs or just get the logs from the machine where error occurred. This option affects the response time of the operation.
A new capability of Metadata tracing. You can now trace all the metadata tags applied to a request and visually confirm if the appropriate metadata tags got applied. This capability now allow you to debug scenarios where the Akamai config is tested but the impact of the Akamai config is not seen on the website. This is an API only capability and you can read more about it here.