Results 4 issues of Andrés Margalef

I don't know if this is for hyper, tokio or mio but it is interesting to use the new io stack from linux 5.1 +. In [async](https://github.com/netty/netty/issues/10006) java world there...

B-upstream
E-hard

This patch add a new struct PropertyPath and a macro used to create a PropertyPath with a slice of &str using const generics to prevent allocations in runtime. Before: ```rust...

I see no aggregation, in some clients like this one in [go](https://github.com/DataDog/datadog-go/blob/208eafd4be2b9752131e66446497244328956b4d/statsd/aggregator.go#L11) the in-memory aggregator is convenient because can reduce UDP traffic, for example multiples increments/count in same metric could...