You need to redesign the ingestion of audit events from your authentication service to allow...

You need to redesign the ingestion of audit events from your authentication service to allow it to handle a large increase in traffic. Currently, the audit service and the authentication system run in the same Compute Engine virtual machine. You plan to use the following Google Cloud tools in the new architecture:

Multiple Compute Engine machines, each running an instance of the authentication service

Multiple Compute Engine machines, each running an instance of the audit service

Pub/Sub to send the events from the authentication services.

How should you set up the topics and subscriptions to ensure that the system can handle a large volume of messages and can scale efficiently?