How do I reset a trigger or alarm from red to green?

[randyh]

Both of my zabbix instances 2.0.x and 3.0.x have triggers/alarms go off and turn red on the screen but the stay red forever.

How do I get these to go back to green after I acknowledge them and fix the problems?

Thanks

[sdwilders]

One of the groups we have on our installation is 'workstations'; this is used for our client's computers. I'd like to be able to report which computers have been left running overnight (say 2am - 4am) so that we can provide our clients with useful information that will enable them to save money but...