RFC5424 formatted information is needed from VM:Operator to be sent to a remote system.
z/VM
VM:Operator
PTF LU18528 - Is needed to be applied and serviced onto your system.
Edit the VMOPER CONFIG Then add the SYSLOGD RECORD with the following input:
SYSLOGD RFC5424 remotehost filename [port/protocol] [TLSLABEL=tlslabel]