PCA Promql Practice Question
Which THREE built-in functions in PromQL are designed specifically to analyze changes over time for gauge metrics? (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
✓
delta()
Functions like delta(), deriv(), and predict_linear() (as well as idelta) operate on gauges over range vectors.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
delta()
Why this is correct
delta() calculates the difference between the first and last value of a gauge in a range vector.
- ✗
rate()
Why it's wrong here
rate() is designed for counters, not gauges.
- ✓
deriv()
Why this is correct
deriv() calculates the per-second derivative of a gauge.
- ✗
increase()
Why it's wrong here
increase() is designed for counters, not gauges.
- ✓
predict_linear()
Why this is correct
predict_linear() predicts future gauge values using linear regression.
About these practice questions
This PCA question is part of Courseiva's 304-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.