[remram]

What does metastability mean in this context? I've only seen it used to mean "appears stable but not actually stable", eg systems that resist small perturbations but never return to nominal after bigger disturbance (like cold boot).

Did you mean "stability"?

[7qW24A]

Marc Brooker’s blog on the topic is good: https://brooker.co.za/blog/2021/05/24/metastable.html

[remram]

That's exactly what I mean, that's why I'm asking what GP meant.