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PDE Practice Question: A company uses Cloud Logging to monitor…
A company uses Cloud Logging to monitor application errors. They want to set up real-time notifications for critical errors. Which two actions are essential? (Choose two.)
⚠ Common exam trap
A common trap is to think that creating a Cloud Pub/Sub notification directly on a log sink (option C) provides real-time notifications for critical errors. However, a log sink exports log entries to a destination (like Pub/Sub) for storage or processing, not for immediate alerting. Real-time notifications require a log-based metric and an alerting policy in Cloud Monitoring (options A and E).
Correct answer & explanation
Option A is correct because a log-based metric is the mechanism that converts matching log entries (e.g., a filter for severity=ERROR or specific critical error text) into a numeric time series that Cloud Monitoring can evaluate; without it there is no metric for alerting. Option E is correct because a Cloud Monitoring alert policy is what actually triggers real-time notifications, and it must be based on the log-based metric created in A to fire when critical errors occur. Option B is not essential since exporting to BigQuery is for retrospective analysis, not real-time alerting. Option C is not essential because a Pub/Sub notification on a log sink is a separate log-routing feature and does not by itself create a Monitoring alert with notification channels. Option D is not essential because VPC Flow Logs capture network traffic metadata and are unrelated to application error alerting.
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