Task 2: Instrument Code for Observability DVA-C02 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A team is deploying a new version of a containerized application to Amazon ECS. They want to ensure that during a rolling update, the new tasks do not receive traffic until they are fully initialized and ready to serve requests. What should they configure?

   • ASet a liveness probe that checks if the container is running.
   • BSet a readiness probe that checks an endpoint like /health/ready.
   • CIncrease the load balancer health check grace period.
   • DUse a startup probe to delay the container start.
   Reveal Solution Discussion Select an answer first
2. 2foundation · easy

   A developer wants to instrument a specific block of code within a traced request to measure its duration separately. What should the developer create using the AWS X-Ray SDK?

   • AAn annotation
   • BA subsegment
   • CA new segment
   • DA trace ID
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4. 3expert · hard

   A team runs a batch processing job that takes 30 minutes. They need to track the number of items processed and the error rate, and alert if the error rate exceeds 10% for any 5-minute period. The job runs on an EC2 instance. What should they implement?

   • AUse CloudWatch Logs to log each item and create a metric filter for errors.
   • BCreate a CloudWatch dashboard to visualize items processed and error rate.
   • CEmit custom metrics for items processed and errors, and create a CloudWatch alarm on the error rate metric.
   • DEnable AWS X-Ray tracing and use trace annotations to count items and errors.
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   A developer is updating a legacy application that logs plain text messages. The operations team wants to query logs for specific user actions and error codes without using third-party tools. What should the developer do?

   • AUse AWS X-Ray to trace user actions and error codes.
   • BAdd more detailed plain text messages with timestamps and user IDs.
   • CChange the logging format to JSON with fields for user action and error code.
   • DSend logs to Amazon S3 and use Athena to query them.
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A developer is designing a logging strategy for a new application. The compliance team requires logs to be retained for at least 1 year, and the operations team wants to be able to search logs for specific error codes. What should the developer configure?

   • AUse CloudWatch Logs with default retention and rely on log groups.
   • BExport logs to Amazon S3 with lifecycle policy to delete after 1 year.
   • CEnable AWS X-Ray tracing to capture error codes.
   • DSet CloudWatch Logs retention to 365 days and use structured logging with error code fields.
   Reveal Solution Discussion Select an answer first