Is there a way to bring in Azure Cloud Services Billing Metics onto Dynatrace for Metric creation, alerts and Dashboards?
Something similar to AWS Billing or more refined.
If not OOTB, How would one bring such metrics to a Dynatrace?
I'm sure there is but it would be somewhat static. For example you could ingest custom metadata that provides the cost for each construct but that would be static. If pricing models change you'll need to update the metadata as well. This route would also not allow you to create it as a metric.
The only other way would be to send the usage data into Dynatrace as a metric event and then build it out from there. Much like you would for CPU temp etc...
For additional metrics, it is worth creating a simple plugin that pulls additional metrics from Azure via the REST Api. This is how I have an extension built to monitor virtual machines on Azure where I don't have OA installed. This is the best solution.