PCA Promql Practice Question
Which THREE aggregation operators in PromQL support the 'by' and 'without' clause modifiers? (Choose three)
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
Most PromQL aggregators support grouping clauses. Examples include sum, avg, min, max, count, stddev, stdvar, bottomk, topk, quantile.
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 supports grouping via 'by' and 'without'.
- ✗
histogram_quantile
Why it's wrong here
histogram_quantile is a function, not a standard aggregation operator with by/without clauses in the same way.
- ✓
avg
Why this is correct
avg supports grouping via 'by' and 'without'.
- ✗
label_replace
Why it's wrong here
label_replace is a transformation function, not an aggregation operator.
- ✓
count
Why this is correct
count supports grouping via 'by' and 'without'.
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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.