PCA Prometheus Fundamentals Practice Question
Which function is used to convert a counter rate into a per-second rate over a time range?
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
✓
rate()
rate() is the standard function for per-second rates of counters.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
rate()
Why this is correct
rate() provides the per-second increase of a counter.
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delta()
Why it's wrong here
delta() is meant for gauges.
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increase()
Why it's wrong here
increase() provides the total delta, not the per-second rate.
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sum()
Why it's wrong here
sum() aggregates across series.
About these practice questions
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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.