PCA Promql Practice Question
Which PromQL function is specifically designed to calculate the per-second average rate of increase of a time series over a given range vector?
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()
The rate() function is designed for counters to calculate the per-second average rate of increase, handling counter resets automatically.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
deriv()
Why it's wrong here
deriv() calculates the per-second derivative of gauge time series using linear regression.
- ✗
irate()
Why it's wrong here
irate() calculates the per-second rate based on the last two data points, not the entire range.
- ✗
increase()
Why it's wrong here
increase() calculates the total increase in the value over the time range, not the per-second rate.
- ✓
rate()
Why this is correct
rate() calculates the per-second average rate of increase of counter time series.
About these practice questions
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JA
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.