Prometheus is primarily used for?

• A. Container orchestration
• B. DNS management
• C. Centralized log storage
• D. Collecting and querying metrics and driving alerts

Answer: (D)

Prometheus is a monitoring system and time-series database designed to collect, store, and expose metrics from applications and infrastructure. It uses a pull-based model to scrape /metrics endpoints from services and exporters, supports dynamic service discovery, and stores data as labeled time series. With its query language PromQL, you can compute rates, averages, and other aggregates over time and across different dimensions to understand system behavior. You can also define alert rules that trigger when conditions are met, with Alertmanager handling routing to the right channels. This combination—collecting metrics, querying them, and driving alerts—is why Prometheus is used. It isn’t primarily for container orchestration, DNS management, or centralized log storage, which are handled by other tools.