onlyOnce sync.Once
}

func (f *leaderMetricsFactory) setProvider(mp MetricsProvider) {
	f.onlyOnce.Do(func() {
		f.metricsProvider = mp
	})
}

func (f *leaderMetricsFactory) newLeaderMetrics() leaderMetricsAdapter {
	mp := f.metricsProvider
	if mp == (noopMetricsProvider{}) {
		return noMetrics{}
	}
	return &defaultLeaderMetrics{
		leader: mp.NewLeaderMetric(),
	}
}

	}

	if lec.Lock == nil {
		return nil, fmt.Errorf("lock must not be nil")
	}
	le := LeaderElector{
		config:  lec,
		clock:   clock.RealClock{},
		metrics: globalMetricsFactory.newLeaderMetrics(),
	}
	le.metrics.leaderOff(le.config.Name)
	return &le, nil
}

type KeyComparisonFunc func(existingKey string) bool

type LeaderElectionConfig struct {