Registry:            registry,
			MaxRequestsInFlight: 2,
		},
		authFn: authFn,

		metricsData: metricGroups,
	}
}

// metricDisplay - contains info on a metric for display purposes.
type metricDisplay struct {
	Name   string   `json:"name"`
	Help   string   `json:"help"`
	Type   string   `json:"type"`
	Labels []string `json:"labels"`
}

func (md metricDisplay) String() string {

var matchingFuncNames = [...]string{
	"http.HandlerFunc.ServeHTTP",
	"cmd.serverMain",
	// add more here ..
}

// quietFlag: Hide startup messages if enabled
// jsonFlag: Display in JSON format, if enabled
var (
	quietFlag, jsonFlag, anonFlag bool
	// Custom function to format error
	errorFmtFunc func(string, error, bool) string
)

// EnableQuiet - turns quiet option on.