Question: The context in which we use word "deficiency" is inspection. Let's say, I look at your gas furnace and file a deficiency report describing some component or part.

What would the opposite of "deficiency" in this context? What would I call the "report" that certifies that your gas furnace is working well?

Thanks!

Answer: 
A Deficiency Report.

A Notice of Compliance ?
Ah, given your elaboration in the comments, I think I see what you're requesting now: a title for a category of statements/fields in a software interface, to complement "deficiencies" and to mean "things which have not been found to be deficient during this inspection".

In that case, I would use a term like **approvals**, as the inspector is clearly either *approving* of some feature or is marking it as a deficiency. It's not strictly speaking an antonym, as approval implies a person making a value judgment while deficiency implies a problem regardless of the presence of a person, but it seems to be the type of word you're looking for here.