}

var (
	globalMetricsV3CollectorPaths []collectorPath
	globalMetricsV3Once           sync.Once
)

func newMetricsV3Server(auth func(h http.Handler) http.Handler) *metricsV3Server {
	registry := prometheus.NewRegistry()
	metricGroups := newMetricGroups(registry)
	globalMetricsV3Once.Do(func() {
		globalMetricsV3CollectorPaths = metricGroups.collectorPaths
	})
	return &metricsV3Server{
		registry: registry,

	}
}

func metricsHTTPHandler(c prometheus.Collector, funcName string) http.Handler {
	registry := prometheus.NewRegistry()

	// Report all other metrics
	logger.CriticalIf(GlobalContext, registry.Register(c))

	// DefaultGatherers include golang metrics and process metrics.
	gatherers := prometheus.Gatherers{
		registry,