You work for an organization that manages an ecommerce site. Your application is deployed behind a global HTTP(S) load balancer. You need to test a new product recommendation algorithm. You plan to use A/B testing to determine the new algorithm's effect on sales in a randomized way. How should you test this feature?

• A.Split traffic between versions using weights.
• B.Enable the new recommendation feature flag on a single instance.
• C.Mirror traffic to the new version of your application.
• D.Use HTTP header-based routing.

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You are writing a Compute Engine hosted application in project A that needs to securely authenticate to a Cloud Pub/Sub topic in project B.
What should you do?

• A.Configure the instances with a service account owned by project B. Add the service account as a Cloud Pub/Sub publisher to project A.
• B.Configure Application Default Credentials to use the private key of a service account owned by project B.
  Add the service account as a Cloud Pub/Sub publisher to project A.
• C.Configure the instances with a service account owned by project A. Add the service account as a publisher on the topic.
• D.Configure Application Default Credentials to use the private key of a service account owned by project A.
  Add the service account as a publisher on the topic

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You want to view the memory usage of your application deployed on Compute Engine. What should you do?

• A.Install the Stackdriver Client Library.
• B.Install the Stackdriver Monitoring Agent.
• C.Use the Stackdriver Metrics Explorer.
• D.Use the Google Cloud Platform Console.

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Your development team has been asked to refactor an existing monolithic application into a set of composable microservices. Which design aspects should you implement for the new application? (Choose two.)

• A.Create an API contract agreement between the microservice implementation and microservice caller.
• B.Require asynchronous communications between all microservice implementations and microservice callers.
• C.Develop the microservice code in the same programming language used by the microservice caller.
• D.Implement a versioning scheme to permit future changes that could be incompatible with the current interface.
• E.Ensure that sufficient instances of the microservice are running to accommodate the performance requirements.

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Your application requires service accounts to be authenticated to GCP products via credentials stored on its host Compute Engine virtual machine instances. You want to distribute these credentials to the host instances as securely as possible. What should you do?

• A.Generate a P12 file from the GCP Console after the instance is deployed, and copy the credentials to the host instance before starting the application.
• B.Commit the credential JSON file into your application's source repository, and have your CI/CD process package it with the software that is deployed to the instance.
• C.Use HTTP signed URLs to securely provide access to the required resources.
• D.Use the instance's service account Application Default Credentials to authenticate to the required resources.

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