Service Discovery

Static configs are simple but don't scale well. Manually defining targets works for small or stable environments, but it becomes difficult to manage in dynamic systems where instances frequently start and stop.

Prometheus supports multiple service discovery mechanisms. It can automatically discover targets using integrations such as:

• Kubernetes
• Consul
• EC2
• DNS
• File-based discovery

This makes it suitable for cloud-native and auto-scaling environments.

File-based service discovery. Prometheus monitors a JSON or YAML file for changes. When the file is updated with new targets, Prometheus automatically reloads them without needing a restart.

Kubernetes integration. In Kubernetes environments, Prometheus can automatically discover pods, services, and endpoints. As workloads scale up or down, Prometheus dynamically adjusts its target list.

Service discovery is essential for monitoring modern, dynamic infrastructure.