metricsV3Path = "/metrics/v3"
)

// Standard env prometheus auth type
const (
	EnvPrometheusAuthType = "MINIO_PROMETHEUS_AUTH_TYPE"
)

type prometheusAuthType string

const (
	prometheusJWT    prometheusAuthType = "jwt"
	prometheusPublic prometheusAuthType = "public"
)

// registerMetricsRouter - add handler functions for metrics.
func registerMetricsRouter(router *mux.Router) {
	// metrics router

type metricsV3Server struct {
	registry *prometheus.Registry
	opts     promhttp.HandlerOpts
	authFn   func(http.Handler) http.Handler

	metricsData *metricsV3Collection
}

func newMetricsV3Server(authType prometheusAuthType) *metricsV3Server {
	registry := prometheus.NewRegistry()
	authFn := AuthMiddleware
	if authType == prometheusPublic {
		authFn = NoAuthMiddleware
	}

	metricGroups := newMetricGroups(registry)