[syslog-ng] repeat messages

We recently changed our system logging code from sysklogd to syslog-ng version 1.9.6 and seem to have lost the following functionality: When consecutively logged messages are identical, instead of seeing each individual duplicate message in the logfile, we see the message "Last message repeated # times". Syslog-ng doesn't seem to support this feature though there is code in log_msg_parse() that tests for 'repeat_msg_string' (defined as "last message repeated"). Why would this test be here if syslog-ng isn't supporting these messages? If the feature is indeed supported, what do I need to do to get it to work? If not, are there plans to add it? When? Thanks Nancy Nichols