groups:
  - name: nexus-alerts
    rules:
      - alert: PostgreSQLDown
        expr: pg_up == 0
        for: 1m
        labels:
          severity: critical
        annotations:
          summary: "PostgreSQL is down"
          description: "PostgreSQL has been down for more than 1 minute."

      - alert: RedisDown
        expr: redis_up == 0
        for: 1m
        labels:
          severity: critical
        annotations:
          summary: "Redis is down"
          description: "Redis has been down for more than 1 minute."

      - alert: HighDiskUsage
        expr: (node_filesystem_avail_bytes / node_filesystem_size_bytes) * 100 < 10
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "Disk usage is high"
          description: "Disk usage is above 90% on {{ $labels.device }}."

      - alert: HighMemoryUsage
        expr: (node_memory_MemTotal_bytes - node_memory_MemAvailable_bytes) / node_memory_MemTotal_bytes * 100 > 85
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "Memory usage is high"
          description: "Memory usage is above 85%."

      - alert: NodeDown
        expr: up{job="node"} == 0
        for: 2m
        labels:
          severity: critical
        annotations:
          summary: "Node exporter is down"
          description: "Node exporter has been down for more than 2 minutes."