{
  "id": "C08-N03",
  "title": "展厅机磁盘满前怎样留出告警时间：测一次日志增长",
  "schema_version": "1.0",
  "evidence_kind": "合成输入与协议；非现场测试结果",
  "tool_versions": {
    "generator": "Python 3.12.4",
    "ffmpeg": "8.0.1（仅实际媒体生成与解码）"
  },
  "required_delivery": "固定运行窗口的日志增长样本、保留规则和容量预算表",
  "input": {
    "free_gib": 40,
    "reserved_gib": 10,
    "growth_gib_per_day": 2,
    "daily_log_gib": [
      1,
      3,
      5,
      7,
      9,
      11,
      13
    ]
  },
  "expected": {
    "usable_gib": 30,
    "estimated_days": 15,
    "constant_rate_assumption": true
  },
  "measurement": null,
  "unmeasured": [
    "实体播放硬件",
    "显示刷新相位",
    "现场拍摄",
    "实际Windows目标机配置"
  ],
  "record_fields": [
    "timestamp",
    "volume_free_bytes",
    "log_bytes",
    "file_count",
    "rotation_event",
    "program_state",
    "reserved_bytes",
    "growth_bytes_per_day",
    "estimated_days"
  ]
}