Physicist here: usually bin size is adjusted to change the interval over which you average. Also rpm is the unit if you want to pin it down to a single number

Physicist here: usually bin size is adjusted to change the interval over which you average. Also rpm is the unit if you want to pin it down to a single number If writing rpm is too long, there's also a trick: write "requests/rpm:" That means: requests measured in rpm. Thus afterwards you can write single numbers which is even shorter