list all metrics of default prom registry

[Khushbukela]

metricFamilies, err := registry.Gather()
this will work if I have created a custom registry in Prometheus
if I use the default registry then how to use this function?

or how can I list all metrics of the default registry

[Khushbukela]

	metricFamilies, err := registry.Gather()
	gathering, err = gatherers.Gather()