Plural of “advice”

When I program objects, I usually refer to them as "object instances". For example, "all Dog instances are instructed to bark()" (or something on those lines). You could similarly say "Advice instances". It's clearer (immediately notifies the reader that you're referring to multiple object instances), grammatical, and allows you to format the name of the object differently (as many people do when referring to code components).

Sometimes we hear the term piece of advice; I suppose this could be pluralized to pieces of advice.

In the context of a program, though, you could refer to objects that provide advice, or, perhaps better yet, objects that advise. In the noun form, maybe use Advice Objects in lieu of Advices.