Lance (JIRA User), @moiseev, can you check with the OSLog folks about this?

@swift-ci create

@zwaldowski Could you please clarify what you mean by "shouldn't be declared with the same availability as `os_signpost`"?

There is currently an os_log API that allows custom user-defined categories passed in as regular String s: https://github.com/apple/swift/blob/master/stdlib/public/SDK/os/os_log.swift#L89-L92

The OSLog.Category type and the corresponding OSLog initializer are only meant to provide a pre-defined pointOfInterest category in a type-safe way.

As can be seen in the tests here: https://github.com/apple/swift/blob/master/test/stdlib/os.swift#L38-L53 it is possible to use both os_log and os_signpost with OSLog instances created using either of the initializers.

It seemed like it was intended as a declaration for an open string enum. If not, it's surprising that its initializer is public. That it steals the useful name "Category" then implicitly slaps a 10.14 deployment target on it makes it surpassingly annoying to safely declare a list of your own app's categories, like our project was doing prior to 4.2.