If you want to suppress a specific syslog message to be sent to syslog server, then you must enter the command as shown.
hostname(config)#no logging message <syslog_id>
信息来源：ASA Syslog Configuration Example
更多的关于syslog_id的信息，可以参考如下文档：
例如：
111008
Error Message %PIX|ASA-5-111008: User user executed the command string
Explanation The user entered any command, with the exception of a show command.
Recommended Action None required.