Icinga nscp check configuration

Hello All,

I am trying to configure the nscp cpu check in such a way that it only has (critical > 90) for the time interval of 5s , (warning >80, critical >90) for 1m and (warning > 60 ,critical >90) for 5m .

When i change the configs in services.conf file, it applies the same alert levels for all the three time intervals.
How can i achieve this ?