Forgot to mention the log entrys from syslog:
Sep 4 17:47:00 mon01 syslog-ng[31206]: I/O error occurred while writing; fd='20', error='Broken pipe (32)'
Sep 4 17:47:00 mon01 syslog-ng[31206]: Suspending write operation because of an I/O error; fd='21', time_reopen='60'

2015-09-04 17:33 GMT+02:00 Basile Bluntschli <basile.bluntschli@gmail.com>:

Hi Team

since version 6951 syslog integration with syslog-ng is not working anymore.
Besides I see approx 20% higher CPU usage since then... Reported by Observium ;)

Thanks
Basile