title: Billing for multiple users of google cloud APIs on one GCP project
body: <p>I have one GCP project and multiple users/service accounts that use the google cloud APIs (e. g. Cloud text-to-speech, Cloud speech-to-text etc.). In the metrics overview for each API it is possible to see how often an API has been called by whom, but for the billing overview, it is not possible to identify which user/service account caused a specific amount of costs. So my question is: <strong>Is it possible to identify the different users/service accounts in the actual billing costs</strong>?</p>
  <p>Normally, one would use labels to distinguish between different users, but unfortunately labels are not supported for those APIs (see list of currently supported services: <a href="https://cloud.google.com/resource-manager/docs/creating-managing-labels#label_support" rel="nofollow noreferrer">https://cloud.google.com/resource-manager/docs/creating-managing-labels#label_support</a>)</p>
  <p>Additionally, each user/service account has a separate Cloud run instance connected to it, that runs a server listening for incoming requests and forwards them to the corresponding API. Would this approach somehow facilitates the mapping from user to costs in one GCP project?</p>