Refactor cpu collector to use perflib instead of WMI.

collector/wmi.go

@@ -4,27 +4,9 @@ import (
 	"bytes"
 	"reflect"
 
-	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/common/log"
 )
 
-// ...
-const (
-	Namespace = "wmi"
-
-	// Conversion factors
-	ticksToSecondsScaleFactor = 1 / 1e7
-)
-
-// Factories ...
-var Factories = make(map[string]func() (Collector, error))
-
-// Collector is the interface a collector has to implement.
-type Collector interface {
-	// Get new metrics and expose them via prometheus registry.
-	Collect(ch chan<- prometheus.Metric) (err error)
-}
-
 func className(src interface{}) string {
 	s := reflect.Indirect(reflect.ValueOf(src))
 	t := s.Type()