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go get github.com/niean/goperfcounter

package xxx

import (
	pfc "github.com/niean/goperfcounter"
)

func foo() {
	if err := bar(); err != nil {
		pfc.Meter("bar.called.error", int64(1))
	}
}

func bar() error {
	// do sth ...
	return nil
}
{
    "counterType": "GAUGE",
    "endpoint": "git",
    "metric": "rate",
    "step": 20,
    "tags": "module=perfcounter,name=bar.called.error",
    "timestamp": 1451397266,
    "value": 13.14
},
{
    "counterType": "GAUGE",
    "endpoint": "git",
    "metric": "sum",
    "step": 20,
    "tags": "module=perfcounter,name=bar.called.error",
    "timestamp": 1451397266,
    "value": 1023
}
{
    "debug": false, // 是否开启调制，默认为false
    "hostname": "", // 机器名(也即endpoint名称)，默认为本机名称
    "tags": "", // tags标签，默认为空。一个tag形如"key=val"，多个tag用逗号分隔；name为保留字段，因此不允许设置形如"name=xxx"的tag。eg. "cop=xiaomi,module=perfcounter"
    "step": 60, // 上报周期，单位s，默认为60s
    "bases":[], // gvm基础信息采集，可选值为"debug"、"runtime"，默认不采集
    "push": { // push数据到Open-Falcon
        "enabled":true, // 是否开启自动push，默认开启
        "api": "" // Open-Falcon接收器地址，默认为本地agent，即"http:// 127.0.0.1:1988/v1/push"
    },
    "http": { // http服务，为了安全考虑，当前只允许本地访问
        "enabled": false, // 是否开启http服务，默认不开启
        "listen": "" // http服务监听地址，默认为空。eg. "0.0.0.0:2015"表示在2015端口开启http监听
    }
}