Thank you for your answer.
I had thought of this solution and actually tested it. And it works fine, by monitoring a directory (or file) that doesn't exist and therby not forwarding anything from that particular server.
My issue with this solution however is if two servers would have different logs in the same path. Say server A has logs in C:\Logs\ for application 1 and server B has logs in C:\Logs\ for application 2. This would cause some confusion as to where logs where coming from, wouldn't it? Or would I just have to specify my search further, to something like:
source = "C:\Logs\*" host = "[hostname]"
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