Disable GO and non-plex metrics.

[derbroti]

Hi,

first of all: thank you for this project - it is still the only exporter that works for me.

Though, it tracks a lot of GO lang metrics which I am not interested in like a bunch of:

# HELP go_goroutines Number of goroutines that currently exist.
# TYPE go_goroutines gauge
go_goroutines 10
# HELP go_info Information about the Go environment.
# TYPE go_info gauge
go_info{version="go1.14.15"} 1

Is there any way to disable this?

Could we have something like this from node_exporter? https://github.com/prometheus/node_exporter/pull/1148

Thanks!