说几个直接或者间接接触过的 Log 库：

1. glog
特点：text log
版权：是 BSD license 吗，不敢确定，其版权声明中好像没提 BSD： https://github.com/google/glog/blob/master/COPYING
链接： https://github.com/google/glog

2. folly/log
特点：text log, async, better log level control
版权：Apache-2.0 license
链接： https://github.com/facebook/folly/tree/main/folly/logging
https://github.com/facebook/folly/blob/main/folly/logging/docs/Comparisons.md

3. nanolog
特点：bin log, async, low latency
版权：ISC License - 看起来蛮松的： https://github.com/PlatformLab/NanoLog/blob/master/LICENSE
https://github.com/PlatformLab/NanoLog


### binlog
特点：bin log, async, low latency, structured(data storage and recover)
版权：Apache-2.0 license
链接： https://github.com/morganstanley/binlog
http://binlog.org/UserGuide.html