stellarmesh-logging

stellarmesh-logging 为 Python 3.11 及以上项目提供标准库 logging 的安全单行 JSON Formatter。主干准备 0.4.0（尚未发布，当前公共版本仍为 0.3.0），不包含远程 Client、HTTP token、后台线程、Kafka、spool、数据库表或日志级别策略，也没有运行时第三方依赖。

# 从本仓库根目录安装待发布源码
pip install ./sdk/python/logging

import logging
import sys

from stellarmesh_logging import JSONFormatter

handler = logging.StreamHandler(sys.stdout)
handler.setFormatter(
    JSONFormatter(
        static_fields={
            "service": "orders-api",
            "environment": "production",
        }
    )
)

logger = logging.getLogger("orders")
logger.setLevel(logging.INFO)
logger.addHandler(handler)
logger.info(
    "request completed",
    extra={"request_id": "request-1", "duration_ms": 12.5},
)

每条记录包含 time、level、msg 和 logger。项目可以用 static_fields 声明稳定字段，并通过 LogRecord.extra 添加自己的顶层字段；基础保留字段不能被覆盖。Formatter 支持异常结构化、Unicode、内置容器和敏感字段规范化后的精确匹配；固定字段和嵌套容器共享属性预算。token_count、session_id 不因敏感词子串而被遮盖。复杂业务对象、自定义容器和 dataclass 需先显式转为字段。

Formatter 不拥有 StreamHandler 或文件描述符。输出到 stdout、stderr、文件或其他目标，日志等级和 Handler 生命周期都由项目使用 Python 标准库配置。推荐输出结构化 stdout，再由项目自己的 Vector 等 Collector完成有界持久缓冲、恢复重放和数据库投影。

0.2.0 是旧远程 Logging v2 客户端的最后版本。0.3.0 是有意的破坏性版本，删除了 Client、LogEvent、StellarmeshHandler、结构化审计门面和关闭入口；仍依赖旧 API 的项目必须先完成 Collector迁移，不能直接升级。事务性审计应写入业务数据库或 transactional outbox，不能把普通 stdout日志当作合规级不可丢失记录。

0.4.0 的支持类型、节点预算和故障责任有意收窄，升级前阅读Python 接入与迁移教程和字段清洗约定。项目自己的凭据名称可通过 extra_sensitive_keys 扩展。

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