docs: add multi-language documentation (ru, fa, zh, tr, ar)
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# 监控与可观测性
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## 健康检查
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### HTTP 健康端点
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```bash
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curl http://localhost:9470/health
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```
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响应:
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```json
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{
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"status": "healthy",
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"version": "0.1.0",
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"uptime_seconds": 86400,
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"checks": {
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"storage": "ok",
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"memory": "ok",
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"connections": "ok"
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}
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}
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```
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### Readiness Probe
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```bash
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curl http://localhost:9470/ready
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```
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服务器准备接受流量时返回 `200 OK`,启动期间返回 `503`。
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## 指标
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### Prometheus 兼容指标
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```bash
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curl http://localhost:9470/metrics
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```
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示例输出:
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```
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baradb_queries_total 152340
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baradb_queries_duration_seconds_bucket{le="0.001"} 45000
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baradb_storage_lsm_size_bytes 2147483648
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baradb_cache_hit_rate 0.94
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baradb_active_connections 42
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```
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### JSON 格式指标
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```bash
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curl http://localhost:9470/metrics?format=json
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```
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## 日志
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### 日志级别
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| 级别 | 描述 |
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|------|------|
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| `debug` | 详细的内部操作 |
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| `info` | 正常操作 |
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| `warn` | 可恢复的问题 |
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| `error` | 需要关注的故障 |
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### 结构化 JSON 日志
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```bash
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BARADB_LOG_LEVEL=info \
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BARADB_LOG_FORMAT=json \
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BARADB_LOG_FILE=/var/log/baradb/baradb.log \
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./build/baradadb
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```
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## Grafana 仪表板
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导入仪表板 ID `baradb-001` 或使用 `monitoring/grafana-dashboard.json` 中的 JSON。
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关键面板:
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- 每秒查询数
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- 查询延迟百分位数 (p50, p95, p99)
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- 存储大小和 SSTable 数量
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- 缓存命中率
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- 活跃连接数
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- 事务率
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- 错误率
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## 集群监控
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```bash
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curl http://node1:9470/metrics/cluster
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```
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## 使用指标进行故障排除
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| 症状 | 指标 | 操作 |
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|------|------|------|
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| 查询慢 | `baradb_queries_duration_seconds` | 检查缓存命中率,考虑添加索引 |
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| 内存高 | `process_resident_memory_bytes` | 减小 memtable/cache 大小 |
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| 存储增长 | `baradb_storage_lsm_size_bytes` | 运行手动压缩 |
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| 连接错误 | `baradb_active_connections` | 增加连接池或添加节点 |
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