No logs in Audit and LTM

Do you have logging enabled? Check it in System -> Logs -> Configuration -> Options -> Under Audit Logging MCP -> Enable or Verbose. I think it's Disabled by default, if you enable it, you should see logs in /var/log/audit, or in web GUI - System -> Logs -> Audit

Yes, it's disabled by default up to version 11.6, and from then on enabled by default.

Roman and Greg Hi, Logging are configured correctly, in fact we have seen some of our configs from the Audit logs. But there is a time that there is no logs made when we configured something.

Which version do you have?

11.5.3 Roman

In that case probably reload of mcpd process might help: https://support.f5.com/kb/en-us/solutions/public/13000/000/sol13030.html But you need to reboot box -> traffic interruption.