How to enable Druid Metric emission?

Hi guys:
In the introduce page of druid metric(http://druidio.cn/docs/0.9.0/operations/metrics.html), it said

Metrics are emitted as JSON objects to a runtime log file or over HTTP (to a service such as Apache Kafka). Metric emission is disabled by default.

     But I have not found the way to enable metrics emission. I will appreciate very much with your help.

You need to configure one of the metric emitter to enable metrics in druid.
For more information on how to configure a emitter and which all are available please refer to “Enabling Metrics” section

http://druid.io/docs/latest/configuration/index.html

Apart from the core emitters that are part of druid there are few more contributions from third party,one of such emitters is Graphite emitter.

Thanks

在 2016年9月6日星期二 UTC+8下午1:56:02,rohit kochar写道: