syslog-ng 无法记录info级别日志的问题求助

各位大佬好，我最近碰到个头疼的问题：syslog-ng死活不记录info级别的日志，但是warn、err这些级别都正常工作。我把当前的配置贴出来，麻烦帮忙看看哪里出问题了？

我的syslog-ng配置内容如下：

@version: 4.6
#
# Syslog-ng default configuration file for Gentoo Linux

# https://bugs.gentoo.org/426814
@include "scl.conf"

options {
    threaded(yes);
    chain_hostnames(no);

    # The default action of syslog-ng is to log a STATS line
    # to the file every 10 minutes.  That's pretty ugly after a while.
    # Change it to every 12 hours so you get a nice daily update of
    # how many messages syslog-ng missed (0).
    stats(freq(43200));
    # The default action of syslog-ng is to log a MARK line
    # to the file every 20 minutes.  That's seems high for most
    # people so turn it down to once an hour.  Set it to zero
    # if you don't want the functionality at all.
    mark_freq(3600);
};

source src { system(); internal(); };

destination messages { file("/var/log/messages"); };
destination kern { file("/var/log/kern.log"); };
destination auth { file("/var/log/auth.log"); };
destination mail {...

我已经确认过日志文件的权限没问题，也重启过好几次syslog-ng服务，但info级别的日志就是没出现在对应的文件里。会不会是配置里漏了什么过滤规则？或者source的设置有问题？麻烦大家帮我排查下，谢谢啦！

备注：内容来源于stack exchange，提问作者GreninjaShuriken4