PCA (Prometheus Certified Associate) sample exam question with answer 599

Question:
What is cross-service 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 a Prometheus server of one service to scrape selected data from another service's Prometheus server to enable alerting and queries against both datasets within a single server

Answer:
D - is the correct answer. Cross-service federation in Prometheus allows a Prometheus server of one service to scrape selected data from another service's Prometheus server to enable alerting and queries against both datasets within a single server