PCA Instrumentation And Exporters Practice Question
If you are using a Histogram, what is the purpose of the '_sum' metric?
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
✓
To store the sum of observations
The _sum metric provides the sum of all observed values, which allows calculating the average when combined with the _count metric.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
To store the median
Why it's wrong here
Median is a quantile calculation.
- ✗
To store the maximum value
Why it's wrong here
Histograms do not store the maximum directly.
- ✓
To store the sum of observations
Why this is correct
This allows calculating averages.
- ✗
To store the total count
Why it's wrong here
That is the _count metric.
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.