Task 2: Instrument Code for Observability DVA-C02 Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A developer is adding logging to a new microservice. The operations team wants to use CloudWatch Logs Insights to analyze logs for patterns like user sign-ins and payment failures. What logging approach should the developer use?

   • ASend logs to Amazon S3 and use Athena for querying.
   • BLog plain text messages with timestamps and event descriptions.
   • CLog events as JSON objects with fields for event type, user ID, and status.
   • DUse AWS X-Ray to trace user sign-ins and payment failures.
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   A developer is using AWS X-Ray to trace a request that flows through an API Gateway, a Lambda function, and DynamoDB. They want to add custom metadata to the trace, such as the user ID and order total. What should they do?

   • AEnable X-Ray tracing on DynamoDB and add annotations there.
   • BUse CloudWatch Logs to record the user ID and order total.
   • CAdd annotations to the Lambda function's segment using the X-Ray SDK.
   • DAdd the metadata to the API Gateway request headers.
   Reveal Solution Discussion Select an answer first
4. 18expert · hard

   A developer needs to notify the operations team when a specific CloudWatch alarm is triggered and when a deployment completes. They want to use a single notification mechanism. What should they do?

   • AUse Amazon SES to send emails from both the alarm and the pipeline.
   • BUse AWS Lambda to poll for alarm states and deployment status, then send emails via SES.
   • CCreate an SNS topic and subscribe the operations team's email. Use the topic as the alarm action and publish a message from the deployment pipeline.
   • DCreate two separate SNS topics, one for alarms and one for deployments.
   Reveal Solution Discussion Select an answer first
5. 19application · medium

   A company runs a containerized web application on Amazon ECS. During deployments, the load balancer sends traffic to new tasks before they are fully ready, causing errors. What should the developer configure to prevent this?

   • AAdd a readiness probe that checks if the application can accept traffic.
   • BAdd a liveness probe that checks if the container is running.
   • CUse a startup probe to delay the start of the container.
   • DIncrease the load balancer health check interval.
   Reveal Solution Discussion Select an answer first
6. 20foundation · easy

   A developer is trying to understand the root cause of a slow response time that occurred in a production application. The developer has access to logs that show individual request details and metrics that show aggregate latency trends. Which concept best describes the ability to derive the root cause by combining and analyzing these different data sources?

   • ALogging
   • BObservability
   • CTracing
   • DMonitoring
   Reveal Solution Discussion Select an answer first