Hi,
I want to create a alert when the PLE < 300seconds. Which values should I use for calculation and percentage?
Are you wanting to create a custom alert or alert off of the default PLE metric that already comes with DPA OOTB?
just the default DPA one.
The alerts for resource metrics are tied to the thresholds within the metrics themselves. So if you use the defaults, it should give a warning at < 600 and critical at < 300. Sounds like those values meet your needs? So, to set up the alert, go to alerts -> manage alerts -> resources (radio button) -> single resource metric (from drop down). Then you can select PLE. I think that's all you need to do...