[Proposal][wip]RP metrics about aro-rp

[mjudeikis]

In addition, we would need to ship golang runtime metrics, like:

func memStats() map[string]float64 {
	m := runtime.MemStats{}
	runtime.ReadMemStats(&m)
	metrics := map[string]float64{
		"memory.objects.HeapObjects": float64(m.HeapObjects),
		"memory.summary.Alloc":       float64(m.Alloc),
		"memory.counters.Mallocs":    perSecondCounter("mallocs", int64(m.Mallocs)),
		"memory.counters.Frees":      perSecondCounter("frees", int64(m.Frees)),
		"memory.summary.System":      float64(m.HeapSys),
		"memory.heap.Idle":           float64(m.HeapIdle),
		"memory.heap.InUse":          float64(m.HeapInuse),
	}

	return metrics
}

[jim-minter]

Tracked in Google doc.