PCA Observability Concepts Practice Question
When configuring Service Discovery in Kubernetes, why might you use relabeling?
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 reduce cardinality by dropping high-variance labels.
Relabeling is used to modify, drop, or keep metrics based on label values, which is essential for managing cardinality and filtering unwanted data.
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 encrypt metric traffic.
Why it's wrong here
Encryption is handled by TLS/HTTPS.
- ✗
To increase scrape frequency.
Why it's wrong here
Frequency is set globally or per job.
- ✗
To store logs in Prometheus.
Why it's wrong here
Prometheus does not store logs.
- ✓
To reduce cardinality by dropping high-variance labels.
Why this is correct
Relabeling is the primary tool to strip labels to save TSDB memory.
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.