PCA Promql Practice Question
What is the purpose of the instant vector selector syntax http_requests_total{job="api-server"}?
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 selects current values of time series matching the metric name and label filter.
It selects the current value of all time series for the metric http_requests_total that have the label job set to api-server.
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 aggregates all API server requests into a single sum.
Why it's wrong here
Selection does not perform aggregation without an explicit operator.
- ✗
It triggers an alert if the job is down.
Why it's wrong here
Queries fetch data and do not trigger alerts on their own.
- ✗
It selects historical data points spanning the last hour for the matching series.
Why it's wrong here
Range brackets [] are required for historical data.
- ✓
It selects current values of time series matching the metric name and label filter.
Why this is correct
Correct. It filters instant samples based on metric name and label matchers.
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.