Format

    alert_syslog: \
        <facility> <priority> <options>

Note:  

As WIN32 does not run syslog servers locally by default, a hostname and port can be passed as options. The default host is 127.0.0.1. The default port is 514.

    output alert_syslog: \
        [host=<hostname[:<port>],] \
        <facility> <priority> <options>