Task 2: Instrument Code for Observability DVA-C02 Practice Questions (Page 5)

Questions 21–25

1. 21foundation · easy

   A developer is designing a logging strategy for a microservices application. The developer wants to be able to trace a single user request across multiple services. Which logging practice is most directly needed to achieve this?

   • AWriting logs to a central log aggregator
   • BSetting a consistent log retention policy
   • CUsing a correlation ID in log entries
   • DIncreasing the log level to DEBUG in production
   Reveal Solution Discussion Select an answer first
2. 22foundation · easy

   A team wants to set up automated alerts when the error rate of an API exceeds a threshold. Which concept is primarily being implemented?

   • AObservability
   • BLogging
   • CTracing
   • DMonitoring
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4. 23application · medium

   A support team is troubleshooting an issue where users report errors, but the team cannot determine which requests failed or why. The application currently only logs at the INFO level and does not record request IDs. What should the developer implement to improve observability?

   • AIncrease the log retention period to 90 days.
   • BEnable AWS X-Ray tracing to capture all requests and errors.
   • CCreate a CloudWatch dashboard to visualize error rates.
   • DAdd structured logging with request IDs and error details, and enable DEBUG level logging in production.
   Reveal Solution Discussion Select an answer first
5. 24foundation · easy

   A developer is logging user actions in an application. The developer wants to include the user ID, action, and timestamp in each log entry. Which logging format is most appropriate for this structured data?

   • APlain text with spaces
   • BCSV
   • CJSON
   • DBinary format
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6. 25application · medium

   A team is debugging a slow microservice that calls several downstream services. They need to see the latency breakdown of each downstream call and correlate it with specific user requests. What should they implement?

   • AUse AWS Distro for OpenTelemetry to automatically instrument all calls without code changes.
   • BCreate a CloudWatch custom metric for each downstream call and graph them.
   • CEnable CloudWatch Logs and add structured logging with request IDs to each call.
   • DAdd AWS X-Ray SDK annotations to each downstream call to record the latency and user ID.
   Reveal Solution Discussion Select an answer first