New check for PSI - Pressure Stall Information

[slalomsk8er]

Describe the solution you'd like

I just learned about PSI from a NETWAYS blog article and now I desire a check for it.

Additional context

No response

[RincewindsHat]

what about check_system_basics from the blog post? :-P

[slalomsk8er]

@RincewindsHat I would prefer the consistency and integration that this plugin collection provides 😉