groups:
  - name: homelab-availability
    rules:
      - alert: HomelabExternalConnectivityDown
        expr: sum(probe_success{job="blackbox-http"} == 0) >= 5
        for: 8m
        labels:
          severity: warning
        annotations:
          summary: "External connectivity appears down"
          description: "At least 5 public homelab endpoints are unreachable. Likely WAN, DNS, or provider issue."

      - alert: HomelabEndpointDown
        expr: (probe_success{job="blackbox-http"} == 0) unless on() (sum(probe_success{job="blackbox-http"} == 0) >= 5)
        for: 8m
        labels:
          severity: critical
        annotations:
          summary: "{{ $labels.instance }} is not reachable"
          description: "Blackbox probe failed for {{ $labels.instance }}."

      - alert: HomelabEndpointSlow
        expr: probe_duration_seconds{job="blackbox-http"} > 5
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "{{ $labels.instance }} is slow"
          description: "Blackbox probe duration is above 5 seconds for {{ $labels.instance }}."

  - name: homelab-host
    rules:
      - alert: HomelabDiskAlmostFull
        expr: 100 * (1 - node_filesystem_avail_bytes{fstype!~"tmpfs|overlay"} / node_filesystem_size_bytes{fstype!~"tmpfs|overlay"}) > 85
        for: 10m
        labels:
          severity: warning
        annotations:
          summary: "Disk usage high on {{ $labels.mountpoint }}"
          description: "{{ $labels.mountpoint }} is above 85% used."

      - alert: HomelabHighMemoryUsage
        expr: 100 * (1 - node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes) > 90
        for: 10m
        labels:
          severity: warning
        annotations:
          summary: "Memory usage high"
          description: "Host memory usage is above 90%."

      - alert: HomelabTraefik5xx
        expr: sum(increase(traefik_service_requests_total{code=~"5.."}[5m])) by (service) >= 5
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: "Traefik 5xx responses for {{ $labels.service }}"
          description: "Traefik reports at least 5 5xx responses for {{ $labels.service }} within 5 minutes."