Some A4s had a factory oil removal pump. Maybe yours? Or perhaps an aftermarket pump was installed? Perhaps that fitting corroded, or loosened, or a hose coming out of it failed, etc.
Hard to tell with the engine in the foxhole like that. There's a lot to like about that method of installation, I'd guess, and a lot to dislike about it too. (Same as all installations, I suppose.) Must be a bear to align.
The oil pan is generally VERY robust. You won't have any trouble finding one, if that's what you need. They're the last thing that's ever going to fail in many engines.
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