If what vmroyale says is true (and think he is right), then you can either filter messages on syslog-server, or if you can not touch syslog-server filters/settings, then set-up syslog-relay on VM, filter messages there, and forward to syslog-server only what you want...
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If you found my answer useful please do *not* mark it as "correct" or "helpful". It is hard to pretend being noob with all those points! 😉
