Page Life Expectancy (PLE) counter

[roul174]

Hi,
i am not able to find PLE (Page life expectancy) counter in set of All Counters.
For my needs this should be very useful.
Is there is an option to add somehow other counters (or ability to compute own counters like Buffer Pool IO Rate (PLE/128.0/Target Pages) etc.)?

[erikdarlingdata]

We don't monitor garbage metrics here.