Dress4Win has end-to-end tests covering 100% of their endpoints. They want to ensure that the move to the cloud does not introduce any new bugs. Which additional testing methods should the developers employ to prevent an outage?

Adding additional unit tests ensures individual components function correctly in the new cloud environment, catching bugs early. Production-scale load tests on a cloud staging environment are crucial for identifying performance bottlenecks and scalability issues before deployment, preventing outages due to unexpected traffic or resource limitations. While end-to-end tests confirm overall functionality, they may not reveal underlying performance problems or component-level regressions introduced by the cloud migration. Google Stackdriver Debugger is for debugging existing issues, not preventing them. Canary tests are for gradual rollouts and impact measurement, not for pre-deployment bug prevention at scale.