// Grafana Alloy configuration for VM2
// Replaces Promtail for log collection and forwarding to Loki

// Discover Docker containers with the logging=promtail label
discovery.docker "containers" {
  host = "unix:///var/run/docker.sock"
  refresh_interval = "5s"

  filter {
    name   = "label"
    values = ["logging=alloy"]
  }
}

// Scrape logs from discovered containers
loki.source.docker "docker_logs" {
  host    = "unix:///var/run/docker.sock"
  targets = discovery.docker.containers.targets

  forward_to = [loki.write.loki.receiver]

  relabel_rules = loki.relabel.docker.rules
}

// Relabel configuration to extract useful labels from Docker metadata
loki.relabel "docker" {
  forward_to = []

  rule {
    source_labels = ["__meta_docker_container_name"]
    regex         = "/(.*)"
    target_label  = "container"
  }

  rule {
    source_labels = ["__meta_docker_container_label_logging_jobname"]
    target_label  = "job"
  }

  // Add external labels
  rule {
    target_label  = "environment"
    replacement   = "production"
  }

  rule {
    target_label  = "cluster"
    replacement   = "myapp-cluster"
  }
}

// Write logs to Loki
loki.write "loki" {
  endpoint {
    url = "http://192.168.1.200:3100/loki/api/v1/push"
  }
}

// Collect system metrics
prometheus.exporter.unix "host" {
  procfs_path = "/host/proc"
  sysfs_path  = "/host/sys"
  rootfs_path = "/host/root"
}

// Scrape metrics from the unix exporter
prometheus.scrape "host" {
  targets    = prometheus.exporter.unix.host.targets
  forward_to = [prometheus.remote_write.mimir.receiver]
}

// Write metrics to Mimir/Prometheus
prometheus.remote_write "mimir" {
  endpoint {
    url = "http://192.168.1.200:9090/api/v1/write"
  }
}