[ovirt-users] Changing ticket duration for VMs

Hi, I'm looking for a way to change the duration of all tickets from all VMs. How can I do this ? I'd like to change it to 5 min instead of 2 min. It seems it is possible to change these parameters using the RestAPI, with "action.grace_period.expiry" or "action.ticket.value"... Anyway, these parameters seems to be accessible only using POST but not GET. How can you retrieve their value then, using POST ? These parameters seem to be available for each VM, is there a way to set it for all VMs in general, even next VM created ? Do they work for all tickets created, or only one single generated ticket where you define its value ?