A company is building a microservices application that consists of many AWS Lambda functions. The development team wants to use AWS Serverless Application Model (AWS SAM) templates to automatically…

Question

Options

• AUse AWS SAM CLI commands in AWS CodeDeploy to invoke the Lambda functions to test the
• BDeclare the EventInvokeConfig on the Lambda functions in the AWS SAM templates with
• CEnable gradual deployments through AWS SAM templates.
• DSet the deployment preference type to Canary10Percent30Minutes. Use hooks to test the
• ESet the deployment preference type to Linear10PercentEvery10Minutes. Use hooks to test the

• A
  9% (3)
• B
  3% (1)
• C
  83% (29)
• E
  6% (2)

Explanation

Enabling gradual deployments in AWS SAM (Option C) activates the DeploymentPreference feature, which leverages AWS CodeDeploy under the hood to automatically shift traffic between Lambda versions - no manual orchestration needed. Pairing this with Canary10Percent30Minutes (Option D) is the right deployment preference because canary is designed exactly for the described use case: route 10% of traffic to the new version for 30 minutes, then make a binary go/no-go decision. SAM hooks (PreTraffic/PostTraffic Lambda functions) run automated validation during that window, making the whole process self-contained in the SAM template.

Why the distractors are wrong:

• A - AWS SAM CLI is a local development/testing tool; using it inside CodeDeploy to invoke functions manually is not an operationally efficient production strategy.
• B - EventInvokeConfig controls asynchronous invocation behavior (retries, destinations on success/failure); it has nothing to do with traffic shifting.
• E - Linear10PercentEvery10Minutes is a valid strategy but wrong here: it progressively increases traffic in increments until 100%, meaning you're never just "testing a small percentage before committing." Canary keeps traffic at 10% for validation and then flips to 100%, which matches the requirement.

Memory tip: Think of a canary in a coal mine - you send a small scout (10%) first to check for danger before committing the whole crew. If the canary survives the window, everyone follows.

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