resolving aliases with hostnames floods the system log

[qn6C04]

I'm getting a flood in system log files general ( /ui/diagnostics/log/core/system ) of "resolving x hostnames (x addresses) for this_alias took 0.11 seconds".
the hostnames in this alias get resolved every 5 min and reported to system log.
How do I stop it from reporting that in system log? I only want to know if it fails to resolve.

[Fright]

rfc5424 format will be enabled soon (if i understand code right) with the severity filter