如何在prometheus / client

I am using a NewGaugeVec to report my metrics:

elapsed := prometheus.NewGaugeVec(prometheus.GaugeOpts{
    Name: "gogrinder_elapsed_ms",
    Help: "Current time elapsed of gogrinder teststep",
}, []string{"teststep", "user", "iteration", "timestamp"})
prometheus.MustRegister(elapsed)

All works fine but I noticed that my custom exporter contains all metrics from prometheus/go_collector.go:

# HELP go_gc_duration_seconds A summary of the GC invocation durations.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} 0.00041795300000000004
go_gc_duration_seconds{quantile="0.25"} 0.00041795300000000004
go_gc_duration_seconds{quantile="0.5"} 0.00041795300000000004
...

I suspect that this is kind of a default behavior but I did not find anything in the documentation on how to disable that. Any ideas on how to configure my custom exporter so that these default metrics disappear?