Nagios Support Forum

In our environment, we are monitoring 300 hosts.

Suppose any of the host is getting down, we are getting alerts of all the services associated with that particular host.

We want to control like that:-

If any of the host is getting down, we want only a single alert to be generated for that host instead of generating individual alerts for all services.

Also, imagine that the host is up and certain services have gone critical. Is it possible for Nagios to generate alerts only for such services?

Is there any possibility to control the above scenario?

This is how nagios works by default. as long as on Step 3 of wizard you use setting similar to the following

Under normal circumstances:
Monitor the host and service(s) every 5 minutes.
When a potential problem is first detected:
Re-check the host and service(s) every 1 minutes up to 5 times before generating an alert.

If the host is in a down state, the services will not send notifications.