In 2018, the billing reports for Pub/Sub were only available at the GCP project level. Since then GCP introduce billing labels, which would provide a more granular level of billing detail.
Labels are key-value pairs that help you organize your Google Cloud resources. You can attach a label to each resource, then filter the resources based on their labels. Information about labels is forwarded to the billing system, so you can break down your billed charges by label. In the context of Pub/Sub, labels are often used to organize fees for a given billing account. You can use labels to associate different Pub/Sub resources (such as topics and subscriptions) with a common cost center.
To use labels for filtering your billing data, you can follow these steps:
- Open the Google Cloud Console, go to the menu, and then click Billing.
- Click on the filter bar at the top of the page, and in the first field, select the label key that you want to filter by.
- In the second field, select the operator for your filter, and enter the label values in the third field.
- Click Apply.
For more details see https://cloud.google.com/pubsub/docs/labels
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