Container and Proxy Metrics

Use these patterns when you need container-level stats or reverse-proxy metrics. Both examples forward into the shared relabel pipeline defined in 01-global.alloy.

Example: Docker Metrics (cAdvisor)

04-docker-metrics.alloy

prometheus.exporter.cadvisor "local" {
  docker_host = "unix:///var/run/docker.sock"
  docker_only = true
  disable_root_cgroup_stats = true
  storage_duration = "5m"
}

prometheus.scrape "scraper" {
  targets    = prometheus.exporter.cadvisor.local.targets
  forward_to = [ prometheus.relabel.common_labels.receiver ]
}

note

The Alloy service needs access to the Docker socket. Ensure the user running Alloy has permission to read /var/run/docker.sock.

Example: Traefik Metrics (Static Target + Relabel)

05-traefik.alloy

// Discovery block to set the address
discovery.relabel "traefik_node" {
  targets = [{
    __address__ = "localhost:8080",
  }]

  // Set a clean instance name
  rule {
    target_label = "instance"
    replacement  = "traefik-proxy"
  }
}

// Scraper block
prometheus.scrape "traefik" {
  targets    = discovery.relabel.traefik_node.output
  // Pointing to your global standardization gate
  forward_to = [prometheus.relabel.common_labels.receiver]

  job_name   = "traefik"
}