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Monitoring and Logging Flashcards

7 cards from real AWS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Monitoring and Logging flashcards as text

  1. When configuring a CloudWatch Alarm, what does setting the 'Treat missing data as' option to 'breaching' cause?

    Answer: The alarm transitions to ALARM state when data is missing, treating absence as a failure

    Setting missing data to 'breaching' means the alarm treats absent data points as if the threshold were exceeded, triggering an ALARM state.

  2. A Lambda function processes deployment events and writes structured JSON logs. Which CloudWatch feature lets the team count error events per minute without changing the function code?

    Answer: CloudWatch Metric Filters

    Metric Filters scan incoming log data for patterns and increment a custom metric each time a match is found, requiring no code changes.

  3. Which X-Ray concept represents the end-to-end journey of a single request as it passes through multiple services?

    Answer: Trace

    A Trace in X-Ray is the complete collection of segments and subsegments generated by a single request across all services it touches.

  4. A DevOps engineer needs to alert on-call staff when deployment error rates exceed 5% over a 5-minute window. The alerting must include a runbook link. Which SNS feature supports this?

    Answer: SNS message attributes in the alarm description or action notification

    CloudWatch Alarm descriptions and SNS message bodies can include runbook URLs, which are delivered to on-call staff via the SNS notification.

  5. Which CloudWatch Logs feature identifies which log sources (IP addresses, users, URLs) contribute most to log volume or error counts?

    Answer: Contributor Insights

    Contributor Insights analyzes log data to identify the top contributors (heavy hitters) to a metric, such as the IPs generating the most errors.

  6. A team runs canary deployments on ECS and wants to automatically roll back if the p99 latency of the new task version exceeds 2 seconds. Which service combination enables this?

    Answer: CodeDeploy deployment group with CloudWatch Alarm-based rollback triggers

    CodeDeploy deployment groups support CloudWatch Alarm-based automatic rollback; if the alarm fires during deployment, CodeDeploy reverts to the previous version.

  7. What is the purpose of CloudWatch Embedded Metrics Format (EMF)?

    Answer: To allow applications to publish high-cardinality custom metrics as structured log events without a separate API call

    EMF lets applications write structured JSON log lines that CloudWatch automatically parses and converts into custom metrics asynchronously.