How do I monitor a service in Linux for when it goes down?

[NewUser1]

I currently have the item and trigger configured as follows

item: proc.num["isc-dhcp-server",,trace]
trigger: min(/server/proc.num["isc-dhcp-server",,trace],5m)

the goal is to get a notification when the service goes down for more than 5 mins. Is this the correct way to do it?

[LenR]

I think you're close, but the trigger min(....) needs " = 0" added.

[NewUser1]

I think you're close, but the trigger min(....) needs " = 0" added.

This seems to work but it doesn't resolve in Monitoring > Problems when the service comes back on.

[tomijs]

You could try to add a recovery expression in the same trigger for it to resolve when it comes back online, that might work. Add a check for last received value and if it is 1 then the problem should resolve.
last(/server/proc.num["isc-dhcp-server",,trace])=1

[NewUser1]

I noticed the problem was I was looking for the service and not the process! got it to work now Thank you!

[LenR]

FYI agent2 can monitor systemd https://www.zabbix.com/integrations/systemd

[wdw]

Would you mind posting your full solution?