Question 640
For the enterprise requirement "A Lambda-backed API team wants to expose only ten percent of traffic to a new function revision before promoting it", the team implemented this change: Publish a Lambda version and configure weighted alias routing with deployment alarms. Which observation should be required before the change is approved?
Explanation
Correct Answer
This measures the behavior required by the specific solution, rather than simply checking that it was configured. Lambda aliases support weighted traffic between published versions with monitored promotion. The acceptance condition is linked directly to the scenario: A Lambda-backed API team wants to expose only ten percent of traffic to a new function revision before promoting it.
Incorrect Answers
Failed security or smoke tests prevent production deployment while passing builds can be promoted. However, this does not establish the required outcome: the alias sends the intended approximate percentage to the canary version and reverts after a simulated alarm.
A newly added target account receives the intended stack instances while an excluded OU does not. However, this does not establish the required outcome: the alias sends the intended approximate percentage to the canary version and reverts after a simulated alarm.
Storage-class distribution follows observed access and availability constraints without extensive manual classification. However, this does not establish the required outcome: the alias sends the intended approximate percentage to the canary version and reverts after a simulated alarm.