Reset Trigger

[lustigerpinguin]

Hi,

I have trouble with resetting a trigger.
My trigger:

{zabbix-test.dev.nsynd.com:vfs.fs.size[/boot,pfree].avg(1200,300)}-{zabbix-test.dev.nsynd.com:vfs.fs.size[/boot,pfree].avg(300)} > 3  | {TRIGGER.VALUE}=1

It check the fill - speed from a partition, if the used space grows to fast, the trigger will be activated; the problem: the message is, without the last part ( | {TRIGGER.VALUE}=1) only for a short time on the dashboard.
Know the problem: how can I "delete" (or ack) the message? Or is there a better way to hold the message on the dashboard until it will be acknowledges?
BTW: I red the feature request: ZBXNEXT-104 but the status is open (why? I think is it necessary!)

Thanks.

Best regards
lustigerpinguin