LTM 9.4.3 hf3 and LTM v9.4.4 include support for remote syslog messages larger than 1K.  The new maximum message size is configurable up to 64K, as per the recent IETF Draft proposed by the syslog Working Group. (1K was the maximum message size previously defined in RFC3164).

A simple iRule may be used to send iRules-generated log messages to a remote log syslog server rather than the local syslog service. For details on using the log command in an iRule to log remotely, check out my article about recent iRules enhancements to the "log" command.