Integrate with open source monitoring/alerting about logdevice

[zhengxiaochuan-3]

Looking forward to this https://github.com/MohamedBassem/logdevice-prometheus
@MohamedBassem

[sh00s]

#37 is figured out far enough (StatsPublisherFactory is now a separate plugin) that this should be viable now. The plugin implementation should derive from StatsPublisherFactory:

https://github.com/facebookincubator/LogDevice/blob/5e4cf130b8e90c6fc78b79e4a2cfbf25c7a62cfd/logdevice/common/plugin/StatsPublisherFactory.h#L24

The StatsPublisherFactory instance should create a derivative of StatsPublisher, which should then implement the publish() method that would publish the stats to an external system:

https://github.com/facebookincubator/LogDevice/blob/5e4cf130b8e90c6fc78b79e4a2cfbf25c7a62cfd/logdevice/common/StatsPublisher.h#L31

[MohamedBassem]

Over the weekend, I added some documentation to https://github.com/MohamedBassem/logdevice-prometheus and added a CI there as well. So it's now in a usable form I hope.

[zhaohaidao]

Is there someone working on it?

I want to try to export the stats to prometheus.

[Zepheus]

I think we need to figure out issue #37 first before we can properly implement this

[motohedgehog]

@zhaohaidao, I don't think we've someone on it, so feel free to go ahead, we'd appreciate a PR :)