pmlastmsg: last message repeated n times

Purpose

Some syslogds are known to emit severity malformed messages with content “last message repeated n times”. These messages can mess up message reception, as they lead to wrong interpretation with the standard RFC3164 parser. Rather than trying to fix this issue in pmrfc3164, we have created a new parser module specifically for these messages. The reason is that some processing overhead is involved in processing these messages (they must be recognized) and we would not like to place this toll on every user but only on those actually in need of the feature. Note that the performance toll is not large – but if you expect a very high message rate with tenthousands of messages per second, you will notice a difference.

This module should be loaded first inside rsyslog’s parser chain. It processes all those messages that contain a PRI, then none or some spaces and then the exact text (case-insensitive) “last message repeated n times” where n must be an integer. All other messages are left untouched.

Configuration Parameters

There do not currently exist any configuration parameters for this module.

Examples

module(load="pmlastmsg")

parser(type="pmlastmsg" name="custom.pmlastmsg")

ruleset(name="ruleset" parser=["custom.pmlastmsg", "rsyslog.rfc5424",
                               "rsyslog.rfc3164"]) {
     ... do processing here ...
}