PCA (Prometheus Certified Associate) sample exam question with answer 326

Question:
What is hierarchical federation in Prometheus?

1. A feature that enables native histograms in Prometheus
2. A way to configure Prometheus servers to scrape from the /federate endpoint of a source server
3. A way to scale Prometheus to environments with tens of data centers and millions of nodes
4. A way to enable cross-service federation in Prometheus

Answer:
C - correct answer. Hierarchical federation in Prometheus allows Prometheus to scale to environments with tens of data centers and millions of nodes. In this use case, the federation topology resembles a tree, with higher-level Prometheus servers collecting aggregated time series data from a larger number of subordinated servers