PCA Instrumentation And Exporters Practice Question
Which action should be avoided when creating labels for custom metrics?
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
✓
Using high-cardinality labels
Adding high-cardinality data (like user IDs or unique request IDs) to labels causes an explosion in the number of time series, which can crash Prometheus.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Using static labels
Why it's wrong here
Static labels are generally fine.
- ✗
Adding job labels
Why it's wrong here
Job labels are essential for identification.
- ✗
Adding instance labels
Why it's wrong here
Instance labels are standard for identifying the source.
- ✓
Using high-cardinality labels
Why this is correct
High-cardinality labels cause excessive memory usage and performance degradation.
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.