PCA Prometheus Architecture & Components 2

Question 1

Which Prometheus component is responsible for short-term storage of time-series data on local disk?

Accepted Answer

TSDB (Time Series Database)

Answer

Prometheus uses its built-in TSDB to store scraped samples locally on disk in a compressed, chunked format.

Question 2

What is the default retention period for data stored in Prometheus's local TSDB?

Accepted Answer

15 days

Answer

By default, Prometheus retains local TSDB data for 15 days unless overridden with --storage.tsdb.retention.time.

Question 3

Which component would you use to expose batch job metrics when the job does not run long enough to be scraped?

Accepted Answer

Pushgateway

Answer

The Pushgateway acts as an intermediary that accepts pushed metrics from short-lived jobs so Prometheus can scrape them later.

Question 4

In Prometheus's federation model, what type of Prometheus instance scrapes metrics from other Prometheus instances?

Accepted Answer

Global Prometheus

Answer

A global (or federated) Prometheus scrapes aggregated or filtered metrics from multiple leaf Prometheus servers via their /federate endpoint.

Question 5

Which HTTP endpoint does Prometheus expose so that another Prometheus instance can scrape a subset of its metrics?

Accepted Answer

/federate

Answer

The /federate endpoint accepts match[] query parameters and returns matching time-series in Prometheus text format for hierarchical federation.

(PCA) Prometheus Certified Associate Practice Test