groups:
  - name: citygen
    rules:
      - alert: CitygenDown
        expr: up{job="citygen"} == 0
        for: 1m
        labels:
          severity: critical
        annotations:
          summary: Citygen cannot be scraped
      - alert: CitygenSlowTick
        expr: citygen_room_tick_seconds > 0.05
        for: 30s
        labels:
          severity: warning
        annotations:
          summary: Room tick exceeds 50 ms
      - alert: CitygenSaveFailure
        expr: increase(citygen_room_save_errors_total[5m]) > 0
        labels:
          severity: critical
        annotations:
          summary: Room snapshot failed; check disk quota and logs