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Message: 3
Date: Fri, 26 Apr 2013 11:29:39 +0200
From: Balazs Scheidler <bazsi77@gmail.com>
Subject: Re: [syslog-ng] Configuration for a centralized syslog-ng
        server
To: "Syslog-ng users' and developers' mailing list"
        <syslog-ng@lists.balabit.hu>, eh@gmail.com
Message-ID:
        <CAKcfE+bvXksZFdz77SkN8VCrmH15wwbTvUk8xJeWFLEwHpay7w@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

How do you know messages are dropped?

Using freq_stats :)

Anyway, I found the issue that wasn't related to syslog-ng.
I had the syslog zfs partition on 92% so, after removing a lot of old files, everything went fine. 

--
d.