This PCD practice question tests your understanding of managing application performance monitoring. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company uses Cloud Monitoring to set up an alerting policy for CPU utilization on Compute Engine instances. They want to be notified when average CPU usage exceeds 80% for 5 minutes. Which threshold type should they use?
Forecast
Why wrong: Forecast alerts on predicted future values.
Change rate
Why wrong: Change rate alerts on sudden changes, not sustained high usage.
Threshold
Threshold alert fires when metric crosses a set value for a duration.
Metric absence
Why wrong: Metric absence alerts when data stops arriving.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Threshold
Option C is correct because a Threshold alerting policy in Cloud Monitoring triggers when a metric's value crosses a defined static boundary. For this use case, setting a threshold of 80% with a duration of 5 minutes directly matches the requirement to alert when average CPU usage exceeds 80% for that period.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Forecast
Why it's wrong here
Forecast alerts on predicted future values.
Change rate
Why it's wrong here
Change rate alerts on sudden changes, not sustained high usage.
Threshold
Why this is correct
Threshold alert fires when metric crosses a set value for a duration.
Related concept
Read the scenario before looking for a memorised answer.
Metric absence
Why it's wrong here
Metric absence alerts when data stops arriving.
Common exam traps
Google Cloud often tests the distinction between alerting on a sustained level (Threshold) versus alerting on a change (Change rate) or a prediction (Forecast), and candidates confuse 'average over time' with 'rate of change'.
Detailed technical explanation
Threshold policies in Cloud Monitoring evaluate metric data over a specified alignment period and duration; for CPU utilization, the metric 'compute.googleapis.com/instance/cpu/utilization' is sampled every 60 seconds by default. The 'Duration' field in the policy ensures the condition is met for the full 5 minutes before firing, preventing flapping from transient spikes. In practice, you might combine this with a notification channel (e.g., email, Pub/Sub) and use a 'condition' like 'metric.type = "compute.googleapis.com/instance/cpu/utilization" AND metric.labels.instance_name = monitoring.regex.full_match(".*")'.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
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FAQ
Managing application performance monitoring — This question tests Managing application performance monitoring — Read the scenario before looking for a memorised answer..
The correct answer is: Threshold — Option C is correct because a Threshold alerting policy in Cloud Monitoring triggers when a metric's value crosses a defined static boundary. For this use case, setting a threshold of 80% with a duration of 5 minutes directly matches the requirement to alert when average CPU usage exceeds 80% for that period.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This PCD practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCD exam.
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