PCA Observability Concepts Practice Question
Why does the 'rate()' function in PromQL behave unexpectedly on counter resets?
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
✓
It detects the reset and ignores the wrap-around.
A counter reset (going to 0) would produce a massive negative number if not handled. 'rate()' automatically accounts for this by assuming a reset occurred.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It returns an error.
Why it's wrong here
It handles resets gracefully.
- ✗
It requires a manual offset.
Why it's wrong here
Manual offsets are not needed.
- ✓
It detects the reset and ignores the wrap-around.
Why this is correct
Prometheus handles monotonic counter resets automatically.
- ✗
It stops recording the metric.
Why it's wrong here
It continues calculation.
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.