What should you do first?

You support a web application that is hosted on Compute Engine. The application provides a booking service for thousands of users. Shortly after the release of a new feature, your monitoring dashboard shows that all users are experiencing latency at login. You want to mitigate the impact of the incident on the users of your service.

What should you do first?
A . Roll back the recent release.
B . Review the Stackdriver monitoring.
C . Upsize the virtual machines running the login services.
D . Deploy a new release to see whether it fixes the problem.

Answer: C

Explanation:

Rollback to previous stable version. Then you need to find what is causing the issue.