Observability and Compliance CT-QDO Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A DevOps team is implementing observability for a distributed system. They want to ensure that when a user reports an issue, they can trace the request across all services and correlate it with logs and metrics. Which practice is most essential to achieve this?

   • ACollect all logs in a central repository and use a log search tool.
   • BPropagate a unique correlation ID in every service call and include it in logs, metrics, and traces.
   • CStore metrics in a time-series database with high retention.
   • DInstrument every service with the same logging library.
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2. 22application · medium

   A DevOps team wants to implement observability in a legacy application that currently has no instrumentation. They have limited resources and need to start with the most impactful practice. Which approach should they take first?

   • ADeploy a monitoring agent that collects system-level metrics only.
   • BAdd structured logging to critical code paths and include correlation IDs where possible.
   • CImplement distributed tracing across all services immediately.
   • DBuild a custom dashboard for every service before adding any instrumentation.
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4. 23application · medium

   A platform team has implemented extensive telemetry: every service logs every request, emits hundreds of metrics, and traces all transactions. However, when an incident occurs, engineers still struggle to determine the root cause because they cannot correlate data across services. Which statement best describes the team's situation?

   • AThey lack both telemetry and observability, because the data is not correlated.
   • BThey have observability but lack telemetry, because the data is not being used effectively.
   • CThey have telemetry but lack observability, because they cannot infer the internal state from the collected data.
   • DThey have both telemetry and observability, because they collect data and can see it in dashboards.
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5. 24foundation · easy

   What is a key practice for implementing observability in DevOps?

   • ARelying solely on infrastructure monitoring tools
   • BCollecting data only after an incident occurs
   • CInstrumenting applications to emit logs, metrics, and traces
   • DUsing a single log file for all system events
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6. 25expert · hard

   A team has implemented comprehensive telemetry collection, but during an incident they find that the data is too noisy and they cannot quickly identify the root cause. They want to improve their observability without adding more data. Which practice is most effective?

   • ACollect even more telemetry to ensure no data is missing.
   • BReduce the retention period for all telemetry to decrease storage costs.
   • CDefine service-level objectives (SLOs) and use error budgets to prioritize alerts and focus on actionable signals.
   • DUse a single dashboard that displays all telemetry in one view.
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