use cgroup cpu

cgroups/cpu.go

@@ -32,9 +32,9 @@ func WithControllers(ctrls ...Controller) Option {
 // Option supports configuring optional settings for runtime metrics.
 type Option func(*config)
 
-func newConfig(controllers []Controller, opts ...Option) config {
+func newConfig(opts ...Option) config {
 	cfg := config{
-		controllers: controllers,
+		controllers: []Controller{ControllerCPU},
 		provider:    otel.GetMeterProvider(),
 		prefix:      "cgroups.",
 	}
@@ -179,20 +179,7 @@ func Start(group string, opts ...Option) (metric.Registration, error) {
 		return nil, fmt.Errorf("load:%w", err)
 	}
 
-	controllers, cerr := manager.Controllers()
-	if cerr != nil {
-		return nil, fmt.Errorf("controllers:%w", cerr)
-	}
-
-	ctrls := make([]Controller, 0, len(controllers))
-	for _, controller := range controllers {
-		ctrl, err := ParseController(controller)
-		if err == nil {
-			ctrls = append(ctrls, ctrl)
-		}
-	}
-
-	cfg := newConfig(ctrls, opts...)
+	cfg := newConfig(opts...)
 
 	cgr := cgroup{
 		meter: cfg.provider.Meter(