// For reference: https://github.com/kubernetes/kubernetes/pull/81387
	legacyregistry.RawMustRegister(grpcprom.DefaultClientMetrics)
	dbMetricsMonitors = make(map[string]struct{})

	l, err := logutil.CreateDefaultZapLogger(etcdClientDebugLevel())
	if err != nil {
		l = zap.NewNop()
	}
	etcd3ClientLogger = l.Named("etcd-client")
}

// etcdClientDebugLevel translates ETCD_CLIENT_DEBUG into zap log level.