if m == nil {
		return
	}
	m.leader.On(name)
}

func (m *defaultLeaderMetrics) leaderOff(name string) {
	if m == nil {
		return
	}
	m.leader.Off(name)
}

type noMetrics struct{}

func (noMetrics) leaderOn(name string)  {}
func (noMetrics) leaderOff(name string) {}

// MetricsProvider generates various metrics used by the leader election.
type MetricsProvider interface {