In NAGIOS i have an host with lots of alerts , host detail- warnings -service , is there any way to acknowledge all of then at one time , or i have to click in all of then one by one?

Sounds like a job for 'yes'!

argh i remember having to deal with this. you actually have a few options at your disposal. there are free third party apps out there that does this type of thing for you. one of them thruk. you may have heard of it. i had some problems with it, but it may work perfectly for you.

i personally prefer to work on things from the backend. i did some rigorous searching. found Nagios Automation. i use a few of the scripts from that site. they work pretty well. does what i need. it looks like they're now charging for ALL their scripts though. try contacting their support email. you should get a free already developed script for what your trying to do. got one about a month ago to remove a bunch of devices all at once

Either that or do some 'expect' scripting. I am a duffer, so I use 'autoexpect'.