What is the meaning of "reason x" in debug output?

Hello.

I issue the command "debug ip flow export", and get this output
===============================================
Oct 31 17:36:39.355: IPFLOW: Sending UDP export pak 14 to 192.168.1.2
port 6000 reason 4
===============================================

What does "reason 4" mean, please?

Where can I find definition about the meaning of these "reason"
numbers?

Thank you.

.

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