Prometheus is an open-source monitoring and alerting toolkit originally developed at SoundCloud and now part of the Cloud Native Computing Foundation (CNCF). It is widely used for collecting and querying time-series metrics from applications, infrastructure, and cloud environments.
The integration between Apache CloudStack and Prometheus is implemented via the native CloudStack Metrics Exporter for Prometheus plugin. The exporter exposes an HTTP /metrics endpoint on the CloudStack Management Server, from which Prometheus scrapes key infrastructure and capacity metrics (hosts, VMs, storage, IP addresses). Prometheus can then be paired with node exporters and other ecosystem tools (Grafana, Alertmanager) to provide full observability.
This guide gives you all the guidance you need to perform a successful Proof of Concept of Apache CloudStack.