OpenTelemetry SDK
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    Variable ATTR_NETWORK_TRANSPORTConst

    ATTR_NETWORK_TRANSPORT: "network.transport" = ...
    tcp
    
    udp
    

    The value SHOULD be normalized to lowercase.

    Consider always setting the transport when setting a port number, since a port number is ambiguous without knowing the transport. For example different processes could be listening on TCP port 12345 and UDP port 12345.