danevandyck

No, the problem is the registry rather than the family. We want to be able to add metric families with the same name but different sets of labels. We can't...

Is the idea that hashing the labels is less expensive than the call to `make_unique`? Seems doubtful but not sure. Regardless, seems like labels should only be hashed once if...

I get it. How about implementing a helper which accepts a pre-computed hash value, thereby avoiding the new first-lookup penalty and avoiding the duplication mentioned earlier?