PCDOE Implementing service monitoring strategies Practice Question
Exhibit
Refer to the exhibit.
Refer to the exhibit.
```yaml name: projects/my-project/alertPolicies/12345 displayName: High Error Rate combiner: OR conditions: - conditionThreshold: filter: metric.type="logging.googleapis.com/user/myapp/error_count" resource.type="k8s_container" aggregations: - alignmentPeriod: 60s perSeriesAligner: ALIGN_RATE duration: 120s comparison: COMPARISON_GT thresholdValue: 5 trigger: count: 1 ```
An engineer notices that this alert fires too frequently during normal operation. Which change would most likely reduce the noise?
⚠ Common exam trap
Google Cloud often tests the misconception that changing the threshold value or aligner is the primary way to reduce alert noise, when in fact adjusting the duration (or evaluation window) is the correct method to filter out transient spikes.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase duration to 300s.
Increasing the duration to 300s means the condition (error rate > 5 per second) must be sustained for a full 5 minutes before the alert fires. This reduces noise by filtering out transient spikes that occur during normal operation, which are shorter than the new duration window. The original 120s duration allowed short-lived bursts to trigger the alert too frequently.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Increase duration to 300s.
Why this is correct
A longer duration means the threshold must be exceeded for 300 seconds continuously, filtering out short-lived spikes that cause false alerts.
- ✗
Change combiner to AND.
Why it's wrong here
The alert has only one condition, so the combiner has no effect; changing it won't reduce noise.
- ✗
Change perSeriesAligner to ALIGN_MEAN.
Why it's wrong here
Using the mean instead of rate could smooth out data, but it might also mask real issues and is less effective than adjusting duration.
- ✗
Decrease thresholdValue to 1.
Why it's wrong here
Lowering the threshold makes the alert more sensitive, likely increasing the number of firings, not reducing noise.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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