PCA Promql Practice Question
Which aggregation operator would you use to calculate the total sum of a metric across all instances?
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
✓
sum()
sum() is the standard operator for calculating totals across dimensions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
sum()
Why this is correct
sum() aggregates values across all series.
- ✗
avg_over_time()
Why it's wrong here
This averages over time, not across instances.
- ✗
total()
Why it's wrong here
total() is not a valid PromQL operator.
- ✗
count()
Why it's wrong here
count() counts the number of series, not the sum of values.
About these practice questions
One of 304 original PCA practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official CNCF / Linux Foundation exam blueprint
This PCA practice question is part of Courseiva's free CNCF / Linux Foundation 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 PCA exam.