Feature idea summary

Cgroups plugin supports only proportional and max Block IO policies. We should support BFQ scheduler as well. Disk stats for the scheduler are in blkio.bfq.io_service_bytes and blkio.bfq.io_serviced files.

提问题？
请把问题现象、相关日志、初步排查结果写清楚，即提供尽量多的线索，这样方便我们定位问题。

提建议？
请写明白建议原因，即为何有此建议。

提修复PR？
请说明为何做此修改，需要做好测试。

提Feature？
建议先将想法提出，不着急写代码，与社区同道沟通，大家觉得OK再做代码实现

---

另外，我们是在做开源软件，不是服务于您的企业，做您的乙方，您一分钱没付，就不要颐指气使了，认同我们这个社区，则参与进来，不认同，就不参与，谢谢理解

I would love to see DNS based Health checks

something like

type: dns
    url: "udp://127.0.0.1:53"
    queryname: "host.example.org"
    querytype: "A"    
    conditions:
      - "[STATUS] == NOERROR"
      - "[DNS].response == 1.2.3.4" 

Has anyone done this safely?

If we can't open port, then lets do something like:

nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
nginx: [emerg] bind() to [::]:80 failed (98: Address already in use)
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Addr