kubernetes/staging/src/k8s.io/apiserver/pkg/endpoints/filters/webhook_duration.go

var watchVerbs …

// WithLatencyTrackers adds a LatencyTrackers instance to the
// context associated with a request so that we can measure latency
// incurred in various components within the apiserver.
func WithLatencyTrackers(handler http.Handler) http.Handler { … }

var _ …

var _ …

type writeLatencyTracker …

func (wt *writeLatencyTracker) Unwrap() http.ResponseWriter { … }

func (wt *writeLatencyTracker) Write(bs []byte) (int, error) { … }