kubernetes/staging/src/k8s.io/component-base/metrics/prometheus/controllers/metrics.go

var once …

var controllerInstanceCount …

type ControllerManagerMetrics …

// NewControllerManagerMetrics create a new ControllerManagerMetrics, with specific manager name.
func NewControllerManagerMetrics(manager string) *ControllerManagerMetrics { … }

// Register controller manager metrics.
func Register() { … }

// ControllerStarted sets the controllerInstanceCount to 1.
// These values use set instead of inc/dec to avoid accidentally double counting
// a controller that starts but fails to properly signal when it crashes.
func (a *ControllerManagerMetrics) ControllerStarted(name string) { … }

// ControllerStopped sets the controllerInstanceCount to 0.
func (a *ControllerManagerMetrics) ControllerStopped(name string) { … }