If you don't give your compare an id, this will add
browser, connectivity and slug to the filename. This
is a breaking change if you use the compare plugin
without an id.
If the change is not significant, it will be zero. Else
Cliffs delta is used to determine how large the change is.
In Graphite we could then alert on everything > 0. And then match
Cliffs delta to tell us if the change is small, medium or large.
Peter Hedenskog