Let's try to optimize against pushing the same fields multiple times onto the log context. To achieve this we make the log context reference counted and return an existing context object if it's using the same fields. A consequence of this is that we have to make sure attaching/detaching is coupled to the lifetime of the context object, so we make the attach and detach functions private for now. If we need independent attach/detach in the future, we can make that work with some extra complexity but since we don't need it yet, let's not support it for now.
System and Service Manager
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