What would be the response of the given curl command when the metric name is empty?

When the metric name is empty in a curl command that interacts with an API like Datadog's, the expected response will indicate an issue with the payload being sent. The API requires certain fields to be populated in order to process the request, and the metric name is a crucial component of that payload.

If the metric name is empty, the API recognizes that it cannot process the request as it's missing a fundamental attribute. Hence, the response will include an error message specifically stating that the metric name is empty, making it clear what aspect of the request is invalid. This is informative for the user, allowing them to correct the mistake before attempting to resend the request.

This response serves as a guide for the user to understand that the absence of a metric name directly leads to a failure in payload validation, and they need to provide a valid metric name for the request to succeed.