The actual release note is this:
Selecting a filter for an event no longer auto populates the “suffix” field with the filter abbreviation.
It is exactly what it means. The suffix still exists and can still be used with %su. The only thing we removed is auto population of the suffix field with the filter name abbreviation. It doesn’t make sense since you can just include the filter name in the file name. The suffix field remains in place for whatever you want to use it for… we just expect it won’t involve filter data. Just an example… probably not a great one, but if you took images from 2 different sites for the same target, the suffix might hold the event’s location (or whatever you want).
I’m not sure… that’s up to you. Do you want the filter’s name in the file? If so, then the answer is yes.