Ability to obtain the upstream service names appearing in APM's Service Map #897
Description
It is required for an external application to obtain the upstream service names of a target service in APM's Service Map.
For example(using the demo gallery), a query with productCatalogService to return checkoutService, frontend-node and recommendationService.
Please provide a query DSL or an API that would return all of the upstream service names for a target service.
Thank you!