[syslog-ng] dropped log?

[fedora fedora]

Hello, i am testing syslog-ng on a server which will be used to collect logs
from different devices on our network, at this point the server is not busy
at all and no outside device is sending syslog to it,  i enabled
stats_freq() in the global config last night and just now i notice there are
5k logs got dropped since then, see below

Aug 14 08:32:59 test syslog-ng[14059]: Log statistics;
dropped='pipe(/dev/xconsole)=5093', processed='center(queued)=2795',
processed='center(received)=705',

So what exactly does "dropped='pipe(/dev/xconsole)=5093'" mean? The load of
this server is not heavy at all, i guess most of these messages are firewall
logs,  why so many logs got dropped?

Thanks!
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