Update FAQ.md

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@ -11,3 +11,12 @@ docker-compose logs --tail=10 -f flask-vue
进入容器,执行:
nc -vz {ip} 8500
```
### blackbox_exporter监控某个站点有异常如何debug
- 在blackbox检测该站点的链接末尾加上`&debug=true`,请求即可,例如:
```
http://10.0.0.26:9115/probe?module=http_2xx&target=https%3A%2F%2Fpayapp.weixin.qq.com&debug=true
```
- 在blackbox_exporter的启动命令增加参数`--log.level=debug`即可开启blackbox_exporter的debug日志systemd方式启动的日志追踪方式
```
journalctl -u blackbox_exporter.service -n20 -f
```