Hello everyone,
I am using Icinga2 in a cluster setup with 2500 services for 160 hosts.
When a service is in timeout, the state is always in unknown. I would like to change this state for critical.
Do you know if it’s possible to update this config ? (for example in icinga2.conf ?)
Thank you ! 
No one ? I tried to find something in the documentation
I believe this is not possible.
The reason is that when a service check times out, you have no idea what the
result would have been if you had got a response, therefore the status is
“unknown”.
Status “critical” means “we know what the result is and it’s not good”.
I can only suggest that you ensure your alerting and notification systems treat
status=unknown in the same way as status=critical.
If you want status=unknown to be the same red colour as status=critical on the
service check grid, you can adjust these colour to your heart’s content by
creating your own theme for Icingaweb2:
mkdir /usr/share/icingaweb2/modules/mymodule
cd /usr/share/icingaweb2/modules/mymodule
mkdir -p public/css/themes
tells you more about how to define the colours.
Regards,
Antony.