What's the best way to purge a metrics set?

[dmitry-ee]

Hi,

I'm trying to implement some clean-up logic on metrics.Set

func generateMetricSet() *metrics.Set {
	ms := metrics.NewSet()
	total_metrics := 1000
	for total_metrics > 0 {
		ms.GetOrCreateCounter(RandStringBytesRmndr(50)).Set(uint64(rand.Int63()))
		total_metrics--
	}
	return ms
}

const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
func RandStringBytesRmndr(n int) string {
	b := make([]byte, n)
	for i := range b {
		b[i] = letterBytes[rand.Int63() % int64(len(letterBytes))]
	}
	return string(b)
}

func BenchmarkMetricParser_Purge(b *testing.B) {
	for i := 0; i < b.N; i++ {
		ms := generateMetricSet()
		for _,m := range ms.ListMetricNames() {
			ms.UnregisterMetric(m)
		}
	}
}
func BenchmarkMetricParser_Purge2(b *testing.B) {
	for i := 0; i < b.N; i++ {
		ms := generateMetricSet()
		_ = ms
		ms = nil
	}
}

BenchmarkMetricParser_Purge-4                458           5385638 ns/op          366105 B/op       4066 allocs/op
BenchmarkMetricParser_Purge2-4               618           3673018 ns/op          315736 B/op       4054 allocs/op

What's is a best approach to do the periodic cleanup?