systemd-syslog: Collect systemd messages using a socket

On platforms running systemd, the systemd-syslog() driver reads the log messages of systemd using the /run/systemd/journal/syslog socket. Note the following points about this driver:

• If possible, use the more reliable systemd-journal() driver instead.

• The socket activation of systemd is buggy, causing some log messages to get lost during system startup.

• If AxoSyslog is running in a jail or a Linux Container (LXC), it will not read from the /dev/kmsg or /proc/kmsg files.

Declaration:

   systemd-syslog();

Example: Using the systemd-syslog() driver

   @version: 4.9.0
    
    source s_systemdd {
        systemd-syslog();
    };
    
    destination d_network {
        syslog("server.host");
    };
    
    log {
        source(s_systemdd);
        destination(d_network);
    };