PSI

Consider adding a standard plugin/check to add support to create service checks for PSI (pressure stall information) cpu, memory and io metrics on Linux hosts running kernel version 4.2.0 or higher.

A user has posted a sample check as s custom plugin/script at https://github.com/hweidner/check-mk-goodies/blob/master/README.md#psi-pressure-stall-information

See also:
https://unixism.net/2019/08/linux-pressure-stall-information-psi-by-example/
https://www.youtube.com/watch?v=Mf5FrDFALW8&t=866s
https://lwn.net/Articles/759781/
https://lwn.net/Articles/759658/

Rationale:
PSI intends to expose metrics we can use to gauge whether processes are actually experiencing actual cpu, memory or io contention whereas cpu_utilization and cpu_load metrics only inform a general idea as to whether there are cpu utilization resource contention on the linux host at hand. This feature has existed in the linux kernel since 4.2.0 circa 2018. The links above give a good starter explanation.