PCA Promql Practice Question
Which TWO of the following are valid aggregation operators in PromQL?
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 and stddev are standard aggregation operators for reducing vector dimensionality.
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 is a built-in aggregation.
- ✓
stddev
Why this is correct
stddev is a built-in aggregation.
- ✗
multiply
Why it's wrong here
multiply is not a valid aggregation operator.
- ✗
filter
Why it's wrong here
filter is not a valid aggregation operator.
- ✗
rate
Why it's wrong here
rate is a function, not an aggregation operator.
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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.