Thanks Charles - here are the sequence of events that generated this error. From the Dashboard interface:
1) Click Adminstration link
2) From Adminstration page, under HQ Server Settings, click Monitoring Defaults Configuration link
3) From HQ Monitoring Defaults Configuration page, under Platform Types, click the EDIT METRIC TEMPLATE link for Linux
4) In the Monitoring Defaults Configuration > Linux platforms page that is presented, there are no Performance metrics listed (text message states 'No metrics of this type have been added to this resource.'). I click on the Performance link, which generates the 'unable to get all the parameters needed to complete this request' and provides a link to the stack.
Don't know if this helps, but here is some kernal/os data for the machine on which the hq server is running:
Linux 2.6.9-5.ELsmp #1 SMP Wed Jan 5 19:30:39 EST 2005 i686 i686 i386 GNU/Linux
Red Hat Enterprise Linux ES release 4 (Nahant Update 3)
Hope this helps. Thanks...
Nathaniel